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02_Royal Farms #482 Stormwater Report 5-02-24 (signed) ROYAL FARMS STORE #482 – WILMINGTON, NEW HANOVER COUNTY, NC Stormwater Management Report For Royal Farms Store # 482 Wilmington, New Hanover County, NC BCG File No. 100403-01-001 Prepared for: Royal Farms 361 Roland Avenue Baltimore, MD 21211 Phone: 410.889.0200 Prepared By: Bowman Consulting Group 880 Island Park Drive, Suite 400 Charleston, SC 29492 Phone: 843.501.0333 Revised: May 02, 2024 ROYAL FARMS STORE #482 – WILMINGTON, NEW HANOVER COUNTY, NC Stormwater Management Narrative This report documents the hydraulic and hydrological analysis performed by Bowman Consulting for the proposed Royal Farms site located along Castle Hayne Road and U. S. Highway 117 in Wilmington, New Hanover County, North Carolina. The report consists of a review of available hydrologic data, methods analysis, development of existing and proposed hydraulic models, and presentation of the impacts of the proposed development. SITE INFORMATION The site is currently 2.81 acres and consists of three parcels that have remnants of several old buildings and associated drives. Royal Farms is proposing to develop the existing parcel with a new convenience store and gas station with parking and supporting infrastructure. Table 1: Site Information Parcel ID R01117-004-001-000, R01117-004-002-000, R01117-004-003-000 Total Site Area 2.81 acres Development Area 2.81 acres Flood Zone The property lies within Zone ‘X’, Zone AE as shown on FEMA FIRM Map No. 3720323100K, dated 8/28/18. Soils within close proximity to the site as defined by NRCS (National Resources Conservation Service) are described in Table 2. All stormwater calculations were performed using Hydrologic Soil Group “D” where soils had a A/D rating. Table 2: Hydrologic Soil Groups DESIGN REQUIREMENTS The stormwater design was based on the New Hanover County Storm Water Design Manual. The following criteria were evaluated based on the standards:  Water Quantity: The post-development discharges rate should be less than pre-development discharge rates for each outfall point for the 2-year, 10-year, 25-year, and 100-year storm events.  Water Quality: Permanent water quality cells, not having a permanent pool, shall be designed to catch 1.5” of runoff over the entire disturbed area and released over at least 24 hours. RAINFALL DATA FOR NEW HANOVER COUNTY New Hanover County rainfall amounts from the Stormwater Design Manual were used for the analysis and are listed below. Table 3: New Hanover County, NC Rainfall Depth Data, 24-hour storm events 2 yr 10 yr 25 yr 50 yr 100 yr 4.50” 7.00” 8.05” 9.00” 10.00” Symbol Description Rating Acres JO Johnson soils A/D 0.7 Ke Kenansville fine sand A 2.1 ROYAL FARMS STORE #482 – WILMINGTON, NEW HANOVER COUNTY, NC HYDROLOGY ANALYSIS AND CALCULATIONS Hydrology and storm water modeling calculations were performed using the latest version of HydroCAD modeling software. Simulations were set up based on information provided within the New Hanover County Storm Water Design Manual. The Soil Conservation Service (NRCS TR-55) hydrologic method was utilized for the estimation of stormwater runoff peak rates and the generation of hydrographs for the routing of stormwater flows; rational method calculations were performed for pipe sizing and inlet analysis. 24-hour duration and Type III storm events were used for this analysis. Input and results can be found summarized in tables throughout this report and in the appendices. PRE-DEVELOPMENT CONDITIONS The existing site contains three parcels with remnants of old buildings and associated drives. The basin PRE DA-1 is comprised of the entire project site area and slopes to the existing ditch at the rear of the property. The ditch flows into an existing 60” RCP into Prince George Creek and into the Northeast Cape Fear River. A summary of the pre-development basin is shown in Table 4 below. The calculations associated with this data can be found in Appendix B. A drainage map showing the Pre-Development Basin Area can be found in Appendix A. Table 4: Pre-Development Basin Summaries POST-DEVELOPMENT CONDITIONS Overview Development of the project site consists of construction of a 4,710 sf convenience store with associated parking, gasoline fueling canopy, drives and curbing. The post-development condition contains three Post Drainage Areas. POST DA-1 comprises the developed portion of the site, POST DA-2 and POST DA-3 comprises the remaining undeveloped portion of the site. The stormwater from POST DA-1 is collected and conveyed within a piped system to be treated in Bioretention-1. Bioretention-1 releases the treated stormwater through an outlet control structure to the existing ditch area. An emergency overflow weir is also installed in the cell bank for a secondary release from the retention cell into the existing ditch. The outfalls follow the pre-development flow offsite through the existing ditch into an existing 60” RCP into Prince George Creek and into the Northeast Cape Fear River. The characteristics for the post-development basins are shown below and calculations can be found in Appendix B. A drainage map identifying the basins can be found in Appendix A. Table 5: Post-Development Basin Summaries Drainage Area ID Area [acres] Composite Curve Number (CN) Time of Concentration (Tc) [min.] POST DA-1 1.61 90 5 POST DA-2 0.47 49 16.5 POST DA-3 0.73 46 23.6 Basin ID Area [acres] Composite Curve Number (CN) Time of Concentration (Tc) [min.] PRE DA-1 2.81 54 25.0 ROYAL FARMS STORE #482 – WILMINGTON, NEW HANOVER COUNTY, NC Stormwater Management Summary The bioretention cell system is designed to provide water quantity and quality control for the developed area of the site. The bioretention outfalls will be controlled by the outlet control structure and secondary outfall using the emergency overflow weir. HydroCAD was utilized to model the site’s peak discharges and hydrographs for the site and associated drainage basins. The pre- and post-development peak discharges for the site are presented below in Table 6. POST DA-1 is routed through Bioretention-1 and its control structure to discharge through a 15” pipe to the existing ditch at the rear of the property. A comparison of the discharges is summarized in the table below. Please see Appendix B for full HydroCAD results. Table 6: Pre and Post Development Peak Discharges Storm Event PRE DA-1 POST BND-1 (POST DA-1 + POST DA-2 + POST DA-3) (cfs) (cfs) 2-yr 24-hr 1.00 0.59 10-yr 24-hr 3.76 1.29 25-yr 24-hr 5.18 1.76 50-yr 24-hr 6.57 2.70 100-yr 24-hr 8.08 3.79 The maximum water surface elevations in the bioretention systems for the respective storms are presented below in Table 7. Table 7: Bioretention Peak Stage Elevations Storm Event Bioretention-1 Bioretention-2 2-yr 24-hr 12.65 14.21 10-yr 24-hr 13.47 14.92 25-yr 24-hr 13.75 15.17 50-yr 24-hr 13.93 15.32 100-yr 24-hr 14.11 15.50 TOB 16.00 16.50 Storage (cf) 64,273 7,482 Water Quality Treatment In accordance with New Hanover County guidelines, the proposed SCMs have been designed to store the required water quality volume, equal to the runoff at build out from all surfaces draining to the system at the 1.5” design storm, for a minimum of 24 hours. Portions of the development not draining ROYAL FARMS STORE #482 – WILMINGTON, NEW HANOVER COUNTY, NC to a cell will discharge by overland flow through grassed or landscaped areas. See Table 8 below for a summary of Water Quality volumes. Complete calculations can be found in Appendix D – Stormwater Calculations. Table 8: Storm Water Quality Volumes Bioretention Treatment Area (ac) Runoff (in) WQv Required (cf) WQv Provided (cf) 1 1.61 1.5 8,592 64,273 2 0.73 1.5 1,325 7,482 Erosion & Sedimentation Control Design Multiple temporary BMPs will be utilized during the construction phase of the project, ensuring compliance with New Hanover guidelines on pollutant load removal and erosion and sedimentation control. The New Hanover County Storm Water Design Manual was referenced for erosion and sedimentation control guidelines and design techniques. Conclusion Based on the results of the included analysis for this development, the requirements of New Hanover County have been adequately provided for this project. There are no anticipated negative impacts to the hydrology of the site or sites downstream, nor an impact on downstream waterbody quality due to improvements. ROYAL FARMS STORE #482 – WILMINGTON, NEW HANOVER COUNTY, NC APPENDICES Appendix A: Maps  Soil Report  FEMA Flood Map  Quad Map  Topo Map  Aerial Map  Pre-Development Drainage Basin Map  Post-Development Drainage Basin Map Appendix B: HydroCAD Hydrograph Model  HydroCAD Hydrograph Results  HyrdoCAD Hydrograph Clogging Results Appendix C: Water Quality Calculations  Stage Storage Volume Chart  Water Quality Calculations  Water Quality Volume Calculations  Forebay Calculations Appendix D: Sediment Control  Diversion Ditch  Sediment Basin Design  Faircloth Skimmer Sizing  Riprap Outlet Design  Existing Pipe Calculations  Storm Sewers Plan (HGL and Gutter Spread) ROYAL FARMS STORE #482 – WILMINGTON, NEW HANOVER COUNTY, NC APPENDIX A Maps Hydrologic Soil Group—New Hanover County, North Carolina (soils_line) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey Page 1 of 4 38 0 4 3 8 0 38 0 4 4 0 0 38 0 4 4 2 0 38 0 4 4 4 0 38 0 4 4 6 0 38 0 4 4 8 0 38 0 4 5 0 0 38 0 4 5 2 0 38 0 4 5 4 0 38 0 4 5 6 0 38 0 4 5 8 0 38 0 4 6 0 0 38 0 4 3 8 0 38 0 4 4 0 0 38 0 4 4 2 0 38 0 4 4 4 0 38 0 4 4 6 0 38 0 4 4 8 0 38 0 4 5 0 0 38 0 4 5 2 0 38 0 4 5 4 0 38 0 4 5 6 0 38 0 4 5 8 0 233050 233070 233090 233110 233130 233150 233170 233190 233210 233050 233070 233090 233110 233130 233150 233170 233190 233210 34° 20' 54'' N 77 ° 5 4 ' 7 ' ' W 34° 20' 54'' N 77 ° 5 4 ' 1 ' ' W 34° 20' 46'' N 77 ° 5 4 ' 7 ' ' W 34° 20' 46'' N 77 ° 5 4 ' 1 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,110 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:15,800. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: New Hanover County, North Carolina Survey Area Data: Version 23, Jan 21, 2022 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Oct 5, 2020—Nov 24, 2020 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Hydrologic Soil Group—New Hanover County, North Carolina (soils_line) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey Page 2 of 4 Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI JO Johnston soils A/D 0.7 24.1% Ke Kenansville fine sand, 0 to 3 percent slopes A 2.1 75.9% Totals for Area of Interest 2.8 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Hydrologic Soil Group—New Hanover County, North Carolina soils_line Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/12/2022 Page 3 of 4 Component Percent Cutoff: None Specified Tie-break Rule: Higher Hydrologic Soil Group—New Hanover County, North Carolina soils_line Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/12/2022 Page 4 of 4 National Flood Hazard Layer FIRMette 0 500 1,000 1,500 2,000250 Feet Ü SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOODHAZARD AREAS Without Base Flood Elevation (BFE)Zone A, V, A99With BFE or DepthZone AE, AO, AH, VE, AR Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areasof 1% annual chance flood with averagedepth less than one foot or with drainageareas of less than one square mileZone X Future Conditions 1% Annual Chance Flood HazardZone X Area with Reduced Flood Risk due to Levee. See Notes.Zone X Area with Flood Risk due to LeveeZone D NO SCREENArea of Minimal Flood Hazard Zone X Area of Undetermined Flood HazardZone D Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall Cross Sections with 1% Annual Chance 17.5 Water Surface Elevation Coastal Transect Coastal Transect Baseline Profile Baseline Hydrographic Feature Base Flood Elevation Line (BFE) Effective LOMRs Limit of Study Jurisdiction Boundary Digital Data Available No Digital Data Available Unmapped This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below.The basemap shown complies with FEMA's basemapaccuracy standards The flood hazard information is derived directly from theauthoritative NFHL web services provided by FEMA. This mapwas exported on 9/12/2022 at 1:55 PM and does notreflect changes or amendments subsequent to this date andtime. The NFHL and effective information may change orbecome superseded by new data over time. This map image is void if the one or more of the following map elements do not appear: basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes. Legend OTHER AREAS OF FLOOD HAZARD OTHER AREAS GENERAL STRUCTURES OTHER FEATURES MAP PANELS 8 B 20.2 The pin displayed on the map is an approximatepoint selected by the user and does not representan authoritative property location. 1:6,000 77°54'22"W 34°21'6"N 77°53'44"W 34°20'37"N Basemap: USGS National Map: Orthoimagery: Data refreshed October, 2020 SITE QU A D M A P QUAD Bo w m a n C o n s u l t i n g G r o u p , L t d . bo w m a n c o n s u l t i n g . c o m © B o w m a n C o n s u l t i n g G r o u p , L t d . 88 0 I s l a n d P a r k D r i v e Su i t e 4 0 0 Ch a r l e s t o n , S C 2 9 4 9 2 Ph o n e : ( 8 4 3 ) 5 0 1 - 0 3 3 3 HW Y 1 1 7 ( N . C O L L E G E R O A D ) A N D H W Y 1 3 3 ( C A S T L E H A Y N E R O A D ) CA S T L E H A Y N E , N E W H A N O V E R C O U N T Y , N C ST O R E # 4 8 2 W I L M I N G T O N , N C Page 13 of 167 ―│―│ ―│―│ ―│ ―│ ―│―│ ―│―│ ―│ ―│ ―│―│―│―│ ―│―│―│―│ ―│―│―│―│ ―│―│―│―│ ―│―│―│―│ ―│―│―│―│―│ ―│―│―│―│―│ ―│―│―│―│ ―│―│―│―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│―│―│ ―│―│―│ ―│―│―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│ ―│ ―│―│ ―│―│ ―│ ―│ ―│―│ ―│ ―│ ―│ ―│ ―│ ―│―│―│―│ ―│―│ ―│ ―│ ―│―│ ―│―│ ―│ ―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│―│―│ ―│―│―│ ―│―│―│ ―│―│―│ ―│―│―│―│ ―│―│―│―│ ―│―│―│ ―│―│―│ ―│―│―│―│―│ ―│―│ ―│ ―│ ―│―│ ―│―│ ―│ ―│ ―│―│ ―│―│ ―│―│ ―│ ―│ ―│ ―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│ ―│ ―│ ―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│―│ ―│ ―│ ―│―│ ―│―│ ―│ ―│ ―│―│ ―│―│ ―│ ―│ ―│ ―│―│ ―│―│ ―│―│ ―│ ―│ ―│ ―│―│―│―│―│―│―│ 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OAKLEYLOOPRD NEW VILLA GE WAY £¤117 NNAVASSARD SIDBURY RD PARA M O U N T W A Y N 2 6 T H S T BRA M T O NRD £¤421 PARME L E R D £¤17421 BR O O K F I E L D D R KENNINGSTONST H A M PTONDR N 8 T H S T NKERRAV E N C O L L E G E R D HOLLY SHELTER RD £¤74 LONGLEAF DR ¬«133 BELLWOODAVE CA P I T A L D R HANO V E R A V E NIX O N L N KINGSDR LYNN A V E TERRY LN TERESA DR ¬«133 £¤17 CAST L E H A Y N E R D WHITMAN AVE EG G E R T A V E EXTO N P A R K L O O P RE M I N I S C E R D DE K K E R R D BLUE CL A Y R D £¤17 EDUC A T I O N L O O P GLEND A L E D R PE T E R S P R I N G S D R N C O L L E G E R D MCR A E S T DEAN DR BRIERWOODRD £¤74 SANDY LN ARLINGTON DR SU T T O N L A K E R D N KERR AVE KIN G S C A S T L E L N CORNE L I U S H A R N E T T E D R FARLE Y D R §¨¦140 OA K L E Y C I R SYC A M O R E A V E ¬«132 ARLENE DR BLOS S O M F E R R Y R D LOCKWOOD DR N T E R M I N A L R D CA P E L A N D I N G R D FLEMING S T £¤17 OL D B R I D G E S I T E R D HERMITAGE RD HAL L W A T E R S D R §¨¦140 KE N N I N G S T O N S T JAMAICA D R £¤17 SP R I N G V A L L E Y R D HERITAGE P A R K D R N 2 3 R D S T ¬«133 VE L V A D R OR A N G E S T ¬«133 INFA N T R Y R D B R U N S W I C K C O PENDER C O NEW HA N O V E R C O N E W H A N O V E R C O No r t h e a s t C a p e F e a r R i v e r LakeSutton NortheastCapeFearRiver SmithCreek S pringBr N o r t h e a st CapeFearRiver Ca r t w h e e l B r a n c h Lake Sutton Lagoon Cr CowpenBr N e s s C r e e k NortheastCapeFearRiver BrunswickRiver BurntMillCreek S m it h C r e e k SpringBr Ne s s C r Northeas t C a pe FearRiver C a p e F e a r R i v e r CowpenBr PrinceGeorgeCr S mith Cr C a p e F e a r R i v e r PrinceGeorgeCreek FishingCr LagoonCr To n y s C r e e k No r t h e a s t C a p e F e a r R i v e r ShoulderBranch Cem Navassa SkippersCorner Castle Hayne Eagle Island Navassa Hightsville Wrightsboro WILMINGTON BigIsland DollisonsSwamp Blue ClayFarms Northchase PinePole Neck Two Pond Bay 95 96 97 98 99 00 01 02 03 04 05 06 94 3807000mN 95 96 97 98 99 00 01 02 03 04 05 06 3794000mN 07 25 26 27 28 29 30 31 32 33 3424 235000mE 26 27 28 29 30 31 32 33 34225000mE 35 TD TD TC TC 34.2500° 34.3750° -78.0000°-77.8750°34.3750° 34.2500°-77.8750°-78.0000° QUADRANGLE LOCATION CASTLE HAYNE QUADRANGLENORTH CAROLINA7.5-MINUTE SERIES CASTLE HAYNE, NC 2019 Expressway Local Connector ROAD CLASSIFICATION Ramp 4WDSecondary Hwy Local Road Interstate Route State RouteUS RouteWX./H U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY This map was produced to conform with the National Geospatial Program US Topo Product Standard, 2011.A metadata file associated with this product is draft version 0.6.18 CONTOUR INTERVAL 5 FEETNORTH AMERICAN VERTICAL DATUM OF 1988 SCALE 1:24 000 1000 500 0 METERS 1000 2000 21KILOMETERS00.51 1 0.5 0 MILES 1 1000 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 FEET × Ø GN MN 1°39´ 29 MILS 9°29´ 169 MILS UTM GRID AND 2019 MAGNETIC NORTH DECLINATION AT CENTER OF SHEET 3800TD TC Grid Zone Designation 18S U.S. National Grid100,000 - m Square ID NORTHCAROLINA 1 Currie 8 Wrightsville Beach 2 Rocky Point3 Mooretown4 Leland5 Scotts Hill6 Winnabow7 Wilmington ADJOINING QUADRANGLES 2 87 4 1 5 3 6 Imagery.....................................................NAIP, May 2016 - November 2016Roads......................................... U.S. Census Bureau, 2016Names............................................................................GNIS, 1980 - 2019Hydrography...............................National Hydrography Dataset, 1899 - 2018Contours............................................National Elevation Dataset, 2008Boundaries..............Multiple sources; see metadata file 2017 - 2018 Wetlands.................FWS National Wetlands Inventory 1982 - 2010 North American Datum of 1983 (NAD83)World Geodetic System of 1984 (WGS84). Projection and1 000-meter grid:Universal Transverse Mercator, Zone 17S\18S Produced by the United States Geological Survey This map is not a legal document. Boundaries may begeneralized for this map scale. Private lands within governmentreservations may not be shown. Obtain permission beforeentering private lands. *7 6 4 3 0 1 6 3 7 8 5 9 8 * NS N . 7 6 4 3 0 1 6 3 7 8 5 9 8 NG A R E F N O . U S G S X 2 4 K 7 5 8 1 Page 14 of 167 PROPOSED SITE LOCATION GARDEN PLACE DR. (70' PUBLIC R/W) BOWMA N D R .(50' PRI V A T E R / W ) CA S T L E H A Y N E R D . (P U B L I C R / W VA R I E S ) U . S . H Y Y 1 1 7 ( C O L L E G E R D . ) (1 0 0 ' P U B L I C R / W ) CA S T L E H A Y N E R D . N C - 1 3 3 ) (60 ' P U B L I C R / W ) ASH ST. (32' PRIVATE R/W) PRINCE GEORGE AVE. (50' PRIVATE R/W) PAR C E L I D : R O 1 1 1 7 - 0 0 4 - 0 0 1 - 0 0 0 , RO1 1 1 7 - 0 0 4 - 0 0 2 - 0 0 0 , R O 1 1 7 - 0 0 4 - 0 0 3 - 0 0 0 5.33 A C AE R I A L M A P AERIAL Bo w m a n C o n s u l t i n g G r o u p , L t d . bo w m a n c o n s u l t i n g . c o m © B o w m a n C o n s u l t i n g G r o u p , L t d . 88 0 I s l a n d P a r k D r i v e Su i t e 4 0 0 Ch a r l e s t o n , S C 2 9 4 9 2 Ph o n e : ( 8 4 3 ) 5 0 1 - 0 3 3 3 HW Y 1 1 7 ( N . C O L L E G E R O A D ) A N D H W Y 1 3 3 ( C A S T L E H A Y N E R O A D ) CA S T L E H A Y N E , N E W H A N O V E R C O U N T Y , N C ST O R E # 4 8 2 W I L M I N G T O N , N C Page 15 of 167 X X X X X X X X X X X X 19 . 8 18 . 4 17 . 8 17 . 4 16 . 4 17 . 9 19 . 4 19 . 1 19 . 7 4.8 4.5 4.1 5.8 10 . 9 15 . 8 17 . 4 16 . 0 14 . 3 14 . 4 12 . 7 15.8 18 . 9 17 . 6 16 . 1 15 . 3 19 . 1 18 . 4 18 . 6 19 . 6 17 . 5 18 . 1 15 . 5 16 . 0 16 . 6 17 . 0 16 . 5 17 . 0 17 . 3 16 . 6 17 . 6 18.9 17 . 5 17 . 7 16 . 5 16 . 8 16 . 9 20 . 0 19.2 5 18.1 3 17.1 2 16 . 5 3 16 . 0 8 15.7 4 15 . 4 9 15 . 5 16 . 1 5.8 5.9 19 . 6 18 . 2 20 . 4 20 . 9 20 . 1 16 . 2 10 . 8 14 . 1 18 . 0 16 . 1 11 . 8 9.9 13 . 8 20 . 7 21 . 5 15 . 5 13 . 2 9.2 16 . 8 12.4 13 . 2 17 . 0 21 . 1 20 . 5 20 . 4 20 . 8 13.6 12 . 3 8.5 11 . 7 12 . 0 10 . 1 13.9 10 . 9 10 . 1 13 . 8 18 . 6 21 . 5 20 . 7 20 . 9 21 . 5 20 . 6 15 . 1 10.8 13 . 4 13 . 8 11 . 7 21 . 5 20 . 4 20 . 7 21 . 2 12 . 4 14 . 3 13 . 3 17 . 1 21 . 3 20 . 9 18 . 4 18 . 8 18 . 6 19 . 1 16 . 5 18 . 3 20 . 1 19 . 8 14 . 8 15 . 9 19 . 8 19 . 8 17 . 8 18 . 9 18 . 6 19 . 1 19.3 17 . 4 19 . 1 20 . 5 N. C . G R I D N O R T H ( N A D 1 9 8 3 ) Standard : 2Area : 113325.492.602 ACRES 10 5 5 5 5 10 10 10 10 10 5 10 10 10 10 15 10 10 15 15 15 15 15 15 15 15 15 15 15 15 20 10 1 0 10 15 20 15 20 20 20 20 15 1 5 1 5 1 5 1 5 1 5 15 20 20 TOP OF BANK TOP OF BANK BEGIN PRE DA-1 Tc CA S T L E H A Y N E R O A D U . S . H I G H W A Y 1 1 7 PRE DA-1 2.81 ACRES Tc = 25.0 MIN OV E R A L L S I T E P L A N PRE Bo w m a n C o n s u l t i n g G r o u p , L t d . bo w m a n c o n s u l t i n g . c o m © B o w m a n C o n s u l t i n g G r o u p , L t d . 88 0 I s l a n d P a r k D r i v e Su i t e 4 0 0 Ch a r l e s t o n , S C 2 9 4 9 2 Ph o n e : ( 8 4 3 ) 5 0 1 - 0 3 3 3 HW Y 1 1 7 ( N . C O L L E G E R O A D ) A N D H W Y 1 3 3 ( C A S T L E H A Y N E R O A D ) CA S T L E H A Y N E , N E W H A N O V E R C O U N T Y , N C ST O R E # 4 8 2 W I L M I N G T O N , N C EXIS T I N G 6 0 " R C P TOP= 1 4 . 2 4 ' IN=6. 2 7 ' EXIS T I N G 60" R C P IN=4. 7 9 ' D C V D C V 19 . 8 18 . 4 17 . 8 17 . 4 16 . 4 17 . 9 19 . 4 19 . 1 19 . 7 4.8 4.5 4.1 5.8 10 . 9 15 . 8 17 . 4 16 . 0 14 . 3 14 . 4 12 . 7 15.8 18 . 9 17 . 6 16 . 1 15 . 3 19 . 1 18 . 4 18 . 6 19 . 6 17 . 5 18 . 1 15 . 5 16 . 0 16 . 6 17 . 0 16 . 5 17 . 0 17 . 3 16 . 6 17 . 6 18.9 17 . 5 17 . 7 16 . 5 16 . 8 16 . 9 20 . 0 19.2 5 18.1 3 17.1 2 16 . 5 3 16 . 0 8 15.7 4 15 . 4 9 15 . 5 16 . 1 5.8 5.9 19 . 6 18 . 2 20 . 4 20 . 9 20 . 1 16 . 2 10 . 8 14 . 1 18 . 0 16 . 1 11 . 8 9.9 13 . 8 20 . 7 21 . 5 15 . 5 13 . 2 9.2 16 . 8 12.4 13 . 2 17 . 0 21 . 1 20 . 5 20 . 4 20 . 8 13.6 12 . 3 8.5 11 . 7 12 . 0 10 . 1 13.9 10 . 9 10 . 1 13 . 8 18 . 6 21 . 5 20 . 7 20 . 9 21 . 5 20 . 6 15 . 1 10.8 13 . 4 13 . 8 11 . 7 21 . 5 20 . 4 20 . 7 21 . 2 12 . 4 14 . 3 13 . 3 17 . 1 21 . 3 20 . 9 18 . 4 18 . 8 18 . 6 19 . 1 16 . 5 18 . 3 20 . 1 19 . 8 14 . 8 15 . 9 19 . 8 19 . 8 17 . 8 18 . 9 18 . 6 19 . 1 19.3 17 . 4 19 . 1 20 . 5 N. C . G R I D N O R T H ( N A D 1 9 8 3 ) Standard : 2Area : 113325.492.602 ACRES 10 5 5 5 5 10 10 10 10 10 5 10 10 10 10 15 10 10 15 15 15 15 15 15 15 15 15 15 15 15 20 10 1 0 10 15 20 15 20 20 20 20 15 1 5 1 5 1 5 1 5 1 5 15 20 20 TOP OF BANK TOP OF BANK CA S T L E H A Y N E R O A D U . S . H I G H W A Y 1 1 7 POST DA-1 1.61 ACRES Tc = 5.0 MIN BIORETENTION 1 BIORETENTION 2 POST DA-2 0.47 ACRES Tc = 16.5 MIN POST DA-3 0.73 ACRES Tc = 23.6 MIN PO S T - D E V E L O P M E N T B A S I N M A P POST Bo w m a n C o n s u l t i n g G r o u p , L t d . bo w m a n c o n s u l t i n g . c o m © B o w m a n C o n s u l t i n g G r o u p , L t d . 88 0 I s l a n d P a r k D r i v e Su i t e 4 0 0 Ch a r l e s t o n , S C 2 9 4 9 2 Ph o n e : ( 8 4 3 ) 5 0 1 - 0 3 3 3 HW Y 1 1 7 ( N . C O L L E G E R O A D ) A N D H W Y 1 3 3 ( C A S T L E H A Y N E R O A D ) CA S T L E H A Y N E , N E W H A N O V E R C O U N T Y , N C ST O R E # 4 8 2 W I L M I N G T O N , N C ROYAL FARMS STORE #482 – WILMINGTON, NEW HANOVER COUNTY, NC APPENDIX B HydroCAD Hydrograph Model 1S PRE DA-1 2S POST DA-1 3S POST DA-2 5S POST DA-3 1P BIORETENTION-1 7P BIORETENTION-2 1L POST BND-1 Routing Diagram for 100403-01-001 HydroCAD model 20240424Prepared by Bowman Consulting Group, Printed 4/24/2024 HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 2HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Rainfall Events Listing Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 002YR Type III 24-hr Default 24.00 1 4.50 2 2 010YR Type III 24-hr Default 24.00 1 7.00 2 3 025YR Type III 24-hr Default 24.00 1 8.05 2 4 050YR Type III 24-hr Default 24.00 1 9.00 2 5 100YR Type III 24-hr Default 24.00 1 10.00 2 6 Custom Type III 24-hr Default 24.00 1 10.80 2 100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 3HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 1.880 39 >75% Grass cover, Good, HSG A (1S) 0.829 40 >75% Grass cover, Good, HSG A (3S, 5S) 0.640 80 >75% Grass cover, Good, HSG D (1S) 0.371 62 >75% Grass cover, Good, HSG D (3S, 5S) 0.230 98 Paved parking, HSG A (1S) 0.060 98 Paved parking, HSG D (1S) 1.115 88 Urban commercial, 85% imp, HSG A (2S) 0.497 95 Urban commercial, 85% imp, HSG D (2S) 5.622 63 TOTAL AREA 100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 4HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 4.054 HSG A 1S, 2S, 3S, 5S 0.000 HSG B 0.000 HSG C 1.568 HSG D 1S, 2S, 3S, 5S 0.000 Other 5.622 TOTAL AREA 100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 5HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 2.709 0.000 0.000 1.011 0.000 3.720 >75% Grass cover, Good 1S, 3S, 5S 0.230 0.000 0.000 0.060 0.000 0.290 Paved parking 1S 1.115 0.000 0.000 0.497 0.000 1.612 Urban commercial, 85% imp 2S 4.054 0.000 0.000 1.568 0.000 5.622 TOTAL AREA 100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 6HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Width (inches) Diam/Height (inches) Inside-Fill (inches) 1 1P 10.00 9.87 40.0 0.0033 0.013 0.0 15.0 0.0 2 7P 12.65 12.35 99.0 0.0030 0.013 0.0 18.0 0.0 Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 7HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=0.69"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=1.00 cfs 0.162 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=3.40"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=6.27 cfs 0.456 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=0.46"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=0.09 cfs 0.018 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=0.33"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=0.08 cfs 0.020 af Peak Elev=12.65' Storage=11,710 cf Inflow=6.27 cfs 0.459 afPond 1P: BIORETENTION-1 Outflow=0.52 cfs 0.395 af Peak Elev=14.21' Storage=824 cf Inflow=0.08 cfs 0.020 afPond 7P: BIORETENTION-2 Outflow=0.01 cfs 0.003 af Inflow=0.59 cfs 0.413 afLink 1L: POST BND-1 Primary=0.59 cfs 0.413 af Total Runoff Area = 5.622 ac Runoff Volume = 0.656 af Average Runoff Depth = 1.40" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 8HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 1.00 cfs @ 12.47 hrs, Volume= 0.162 af, Depth= 0.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 002YR Rainfall=4.50" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr 002YR Rainfall=4.50" Runoff Area=2.810 ac Runoff Volume=0.162 af Runoff Depth=0.69" Flow Length=280' Tc=25.0 min CN=54 1.00 cfs Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 9HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 6.27 cfs @ 12.07 hrs, Volume= 0.456 af, Depth= 3.40" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 002YR Rainfall=4.50" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 7 6 5 4 3 2 1 0 Type III 24-hr 002YR Rainfall=4.50" Runoff Area=1.612 ac Runoff Volume=0.456 af Runoff Depth=3.40" Tc=5.0 min CN=90 6.27 cfs Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 10HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 0.09 cfs @ 12.44 hrs, Volume= 0.018 af, Depth= 0.46" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 002YR Rainfall=4.50" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr 002YR Rainfall=4.50" Runoff Area=0.467 ac Runoff Volume=0.018 af Runoff Depth=0.46" Flow Length=168' Tc=16.5 min CN=49 0.09 cfs Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 11HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 0.08 cfs @ 12.61 hrs, Volume= 0.020 af, Depth= 0.33" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 002YR Rainfall=4.50" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr 002YR Rainfall=4.50" Runoff Area=0.733 ac Runoff Volume=0.020 af Runoff Depth=0.33" Flow Length=183' Tc=23.6 min CN=46 0.08 cfs Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 12HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 2.35" for 002YR event Inflow = 6.27 cfs @ 12.07 hrs, Volume= 0.459 af Outflow = 0.52 cfs @ 13.06 hrs, Volume= 0.395 af, Atten= 92%, Lag= 59.0 min Primary = 0.52 cfs @ 13.06 hrs, Volume= 0.395 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 12.65' @ 13.06 hrs Surf.Area= 10,131 sf Storage= 11,710 cf Plug-Flow detention time= 481.0 min calculated for 0.395 af (86% of inflow) Center-of-Mass det. time= 418.3 min ( 1,216.7 - 798.3 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=0.52 cfs @ 13.06 hrs HW=12.65' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 0.52 cfs of 8.34 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.44 cfs @ 3.20 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.08 cfs) Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 13HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=12.65' Storage=11,710 cf 6.27 cfs 0.52 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 14HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 15HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 0.33" for 002YR event Inflow = 0.08 cfs @ 12.61 hrs, Volume= 0.020 af Outflow = 0.01 cfs @ 24.22 hrs, Volume= 0.003 af, Atten= 91%, Lag= 696.8 min Primary = 0.01 cfs @ 24.22 hrs, Volume= 0.003 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 14.21' @ 24.22 hrs Surf.Area= 1,524 sf Storage= 824 cf Plug-Flow detention time= 760.2 min calculated for 0.003 af (15% of inflow) Center-of-Mass det. time= 539.8 min ( 1,515.9 - 976.0 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.01 cfs @ 24.22 hrs HW=14.21' TW=12.13' (Dynamic Tailwater) 1=Culvert (Passes 0.01 cfs of 6.12 cfs potential flow) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.01 cfs) Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 16HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.733 ac Peak Elev=14.21' Storage=824 cf 0.08 cfs 0.01 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 17HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 18HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 1.76" for 002YR event Inflow = 0.59 cfs @ 12.53 hrs, Volume= 0.413 af Primary = 0.59 cfs @ 12.53 hrs, Volume= 0.413 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=2.812 ac0.59 cfs 0.59 cfs Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 19HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=2.03"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=3.76 cfs 0.475 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=5.82"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=10.44 cfs 0.782 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=1.58"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=0.53 cfs 0.061 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=1.32"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=0.56 cfs 0.081 af Peak Elev=13.47' Storage=20,555 cf Inflow=10.44 cfs 0.846 afPond 1P: BIORETENTION-1 Outflow=0.85 cfs 0.775 af Peak Elev=14.92' Storage=1,179 cf Inflow=0.56 cfs 0.081 afPond 7P: BIORETENTION-2 Outflow=0.19 cfs 0.063 af Inflow=1.29 cfs 0.836 afLink 1L: POST BND-1 Primary=1.29 cfs 0.836 af Total Runoff Area = 5.622 ac Runoff Volume = 1.400 af Average Runoff Depth = 2.99" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 20HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 3.76 cfs @ 12.39 hrs, Volume= 0.475 af, Depth= 2.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 010YR Rainfall=7.00" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Type III 24-hr 010YR Rainfall=7.00" Runoff Area=2.810 ac Runoff Volume=0.475 af Runoff Depth=2.03" Flow Length=280' Tc=25.0 min CN=54 3.76 cfs Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 21HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 10.44 cfs @ 12.07 hrs, Volume= 0.782 af, Depth= 5.82" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 010YR Rainfall=7.00" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 010YR Rainfall=7.00" Runoff Area=1.612 ac Runoff Volume=0.782 af Runoff Depth=5.82" Tc=5.0 min CN=90 10.44 cfs Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 22HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 0.53 cfs @ 12.27 hrs, Volume= 0.061 af, Depth= 1.58" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 010YR Rainfall=7.00" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 010YR Rainfall=7.00" Runoff Area=0.467 ac Runoff Volume=0.061 af Runoff Depth=1.58" Flow Length=168' Tc=16.5 min CN=49 0.53 cfs Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 23HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 0.56 cfs @ 12.41 hrs, Volume= 0.081 af, Depth= 1.32" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 010YR Rainfall=7.00" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 010YR Rainfall=7.00" Runoff Area=0.733 ac Runoff Volume=0.081 af Runoff Depth=1.32" Flow Length=183' Tc=23.6 min CN=46 0.56 cfs Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 24HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 4.33" for 010YR event Inflow = 10.44 cfs @ 12.07 hrs, Volume= 0.846 af Outflow = 0.85 cfs @ 13.49 hrs, Volume= 0.775 af, Atten= 92%, Lag= 85.4 min Primary = 0.85 cfs @ 13.49 hrs, Volume= 0.775 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 13.47' @ 13.49 hrs Surf.Area= 11,301 sf Storage= 20,555 cf Plug-Flow detention time= 411.9 min calculated for 0.774 af (92% of inflow) Center-of-Mass det. time= 365.6 min ( 1,165.8 - 800.2 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=0.85 cfs @ 13.49 hrs HW=13.47' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 0.85 cfs of 10.35 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.74 cfs @ 5.42 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.11 cfs) Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 25HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=13.47' Storage=20,555 cf 10.44 cfs 0.85 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 26HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 27HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 1.32" for 010YR event Inflow = 0.56 cfs @ 12.41 hrs, Volume= 0.081 af Outflow = 0.19 cfs @ 13.08 hrs, Volume= 0.063 af, Atten= 66%, Lag= 40.3 min Primary = 0.19 cfs @ 13.08 hrs, Volume= 0.063 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 14.92' @ 13.08 hrs Surf.Area= 2,487 sf Storage= 1,179 cf Plug-Flow detention time= 237.6 min calculated for 0.063 af (79% of inflow) Center-of-Mass det. time= 150.5 min ( 1,061.8 - 911.4 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.19 cfs @ 13.08 hrs HW=14.92' TW=13.46' (Dynamic Tailwater) 1=Culvert (Passes 0.19 cfs of 8.45 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.16 cfs @ 1.76 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.03 cfs) Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 28HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.733 ac Peak Elev=14.92' Storage=1,179 cf 0.56 cfs 0.19 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 29HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 30HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 3.57" for 010YR event Inflow = 1.29 cfs @ 12.30 hrs, Volume= 0.836 af Primary = 1.29 cfs @ 12.30 hrs, Volume= 0.836 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Inflow Area=2.812 ac1.29 cfs 1.29 cfs Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 31HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=2.71"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=5.18 cfs 0.634 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=6.85"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=12.18 cfs 0.921 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=2.18"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=0.78 cfs 0.085 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=1.86"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=0.86 cfs 0.114 af Peak Elev=13.75' Storage=23,670 cf Inflow=12.18 cfs 1.017 afPond 1P: BIORETENTION-1 Outflow=1.42 cfs 0.945 af Peak Elev=15.17' Storage=1,399 cf Inflow=0.86 cfs 0.114 afPond 7P: BIORETENTION-2 Outflow=0.41 cfs 0.097 af Inflow=1.76 cfs 1.030 afLink 1L: POST BND-1 Primary=1.76 cfs 1.030 af Total Runoff Area = 5.622 ac Runoff Volume = 1.754 af Average Runoff Depth = 3.74" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 32HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 5.18 cfs @ 12.38 hrs, Volume= 0.634 af, Depth= 2.71" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 025YR Rainfall=8.05" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 5 4 3 2 1 0 Type III 24-hr 025YR Rainfall=8.05" Runoff Area=2.810 ac Runoff Volume=0.634 af Runoff Depth=2.71" Flow Length=280' Tc=25.0 min CN=54 5.18 cfs Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 33HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 12.18 cfs @ 12.07 hrs, Volume= 0.921 af, Depth= 6.85" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 025YR Rainfall=8.05" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 025YR Rainfall=8.05" Runoff Area=1.612 ac Runoff Volume=0.921 af Runoff Depth=6.85" Tc=5.0 min CN=90 12.18 cfs Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 34HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 0.78 cfs @ 12.26 hrs, Volume= 0.085 af, Depth= 2.18" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 025YR Rainfall=8.05" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 025YR Rainfall=8.05" Runoff Area=0.467 ac Runoff Volume=0.085 af Runoff Depth=2.18" Flow Length=168' Tc=16.5 min CN=49 0.78 cfs Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 35HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 0.86 cfs @ 12.39 hrs, Volume= 0.114 af, Depth= 1.86" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 025YR Rainfall=8.05" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 025YR Rainfall=8.05" Runoff Area=0.733 ac Runoff Volume=0.114 af Runoff Depth=1.86" Flow Length=183' Tc=23.6 min CN=46 0.86 cfs Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 36HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 5.21" for 025YR event Inflow = 12.18 cfs @ 12.07 hrs, Volume= 1.017 af Outflow = 1.42 cfs @ 13.00 hrs, Volume= 0.945 af, Atten= 88%, Lag= 55.8 min Primary = 1.42 cfs @ 13.00 hrs, Volume= 0.945 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 13.75' @ 13.00 hrs Surf.Area= 11,691 sf Storage= 23,670 cf Plug-Flow detention time= 382.0 min calculated for 0.944 af (93% of inflow) Center-of-Mass det. time= 341.8 min ( 1,138.2 - 796.5 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=1.42 cfs @ 13.00 hrs HW=13.75' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 1.42 cfs of 10.93 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.81 cfs @ 5.97 fps) 3=Orifice/Grate (Orifice Controls 0.49 cfs @ 1.59 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.12 cfs) Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 37HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=13.75' Storage=23,670 cf 12.18 cfs 1.42 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 38HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 39HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 1.86" for 025YR event Inflow = 0.86 cfs @ 12.39 hrs, Volume= 0.114 af Outflow = 0.41 cfs @ 12.83 hrs, Volume= 0.097 af, Atten= 53%, Lag= 26.6 min Primary = 0.41 cfs @ 12.83 hrs, Volume= 0.097 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 15.17' @ 12.83 hrs Surf.Area= 2,832 sf Storage= 1,399 cf Plug-Flow detention time= 171.0 min calculated for 0.097 af (85% of inflow) Center-of-Mass det. time= 104.2 min ( 1,003.0 - 898.8 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.41 cfs @ 12.83 hrs HW=15.17' TW=13.74' (Dynamic Tailwater) 1=Culvert (Passes 0.41 cfs of 9.40 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.37 cfs @ 2.70 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.04 cfs) Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 40HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.733 ac Peak Elev=15.17' Storage=1,399 cf 0.86 cfs 0.41 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 41HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 42HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 4.39" for 025YR event Inflow = 1.76 cfs @ 12.50 hrs, Volume= 1.030 af Primary = 1.76 cfs @ 12.50 hrs, Volume= 1.030 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Inflow Area=2.812 ac1.76 cfs 1.76 cfs Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 43HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=3.37"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=6.57 cfs 0.788 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=7.79"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=13.75 cfs 1.047 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=2.76"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=1.02 cfs 0.108 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=2.41"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=1.17 cfs 0.147 af Peak Elev=13.93' Storage=25,799 cf Inflow=13.75 cfs 1.176 afPond 1P: BIORETENTION-1 Outflow=2.10 cfs 1.103 af Peak Elev=15.32' Storage=1,823 cf Inflow=1.17 cfs 0.147 afPond 7P: BIORETENTION-2 Outflow=0.49 cfs 0.130 af Inflow=2.70 cfs 1.210 afLink 1L: POST BND-1 Primary=2.70 cfs 1.210 af Total Runoff Area = 5.622 ac Runoff Volume = 2.089 af Average Runoff Depth = 4.46" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 44HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 6.57 cfs @ 12.37 hrs, Volume= 0.788 af, Depth= 3.37" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 050YR Rainfall=9.00" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 7 6 5 4 3 2 1 0 Type III 24-hr 050YR Rainfall=9.00" Runoff Area=2.810 ac Runoff Volume=0.788 af Runoff Depth=3.37" Flow Length=280' Tc=25.0 min CN=54 6.57 cfs Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 45HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 13.75 cfs @ 12.07 hrs, Volume= 1.047 af, Depth= 7.79" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 050YR Rainfall=9.00" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 050YR Rainfall=9.00" Runoff Area=1.612 ac Runoff Volume=1.047 af Runoff Depth=7.79" Tc=5.0 min CN=90 13.75 cfs Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 46HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 1.02 cfs @ 12.25 hrs, Volume= 0.108 af, Depth= 2.76" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 050YR Rainfall=9.00" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr 050YR Rainfall=9.00" Runoff Area=0.467 ac Runoff Volume=0.108 af Runoff Depth=2.76" Flow Length=168' Tc=16.5 min CN=49 1.02 cfs Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 47HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 1.17 cfs @ 12.37 hrs, Volume= 0.147 af, Depth= 2.41" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 050YR Rainfall=9.00" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr 050YR Rainfall=9.00" Runoff Area=0.733 ac Runoff Volume=0.147 af Runoff Depth=2.41" Flow Length=183' Tc=23.6 min CN=46 1.17 cfs Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 48HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 6.02" for 050YR event Inflow = 13.75 cfs @ 12.07 hrs, Volume= 1.176 af Outflow = 2.10 cfs @ 12.65 hrs, Volume= 1.103 af, Atten= 85%, Lag= 34.9 min Primary = 2.10 cfs @ 12.65 hrs, Volume= 1.103 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 13.93' @ 12.65 hrs Surf.Area= 11,951 sf Storage= 25,799 cf Plug-Flow detention time= 350.6 min calculated for 1.102 af (94% of inflow) Center-of-Mass det. time= 314.9 min ( 1,108.9 - 794.0 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=2.10 cfs @ 12.65 hrs HW=13.93' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 2.10 cfs of 11.30 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.86 cfs @ 6.31 fps) 3=Orifice/Grate (Orifice Controls 1.12 cfs @ 2.09 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.12 cfs) Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 49HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=13.93' Storage=25,799 cf 13.75 cfs 2.10 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 50HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 51HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 2.41" for 050YR event Inflow = 1.17 cfs @ 12.37 hrs, Volume= 0.147 af Outflow = 0.49 cfs @ 12.86 hrs, Volume= 0.130 af, Atten= 58%, Lag= 29.2 min Primary = 0.49 cfs @ 12.86 hrs, Volume= 0.130 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 15.32' @ 12.86 hrs Surf.Area= 3,008 sf Storage= 1,823 cf Plug-Flow detention time= 140.1 min calculated for 0.130 af (88% of inflow) Center-of-Mass det. time= 84.4 min ( 974.5 - 890.1 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.49 cfs @ 12.86 hrs HW=15.32' TW=13.92' (Dynamic Tailwater) 1=Culvert (Passes 0.49 cfs of 9.68 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.45 cfs @ 3.27 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.04 cfs) Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 52HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Inflow Area=0.733 ac Peak Elev=15.32' Storage=1,823 cf 1.17 cfs 0.49 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 53HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 54HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 5.16" for 050YR event Inflow = 2.70 cfs @ 12.49 hrs, Volume= 1.210 af Primary = 2.70 cfs @ 12.49 hrs, Volume= 1.210 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 3 2 1 0 Inflow Area=2.812 ac2.70 cfs 2.70 cfs Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 55HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=4.09"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=8.08 cfs 0.959 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=8.78"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=15.39 cfs 1.179 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=3.42"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=1.29 cfs 0.133 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=3.02"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=1.51 cfs 0.184 af Peak Elev=14.11' Storage=28,042 cf Inflow=15.39 cfs 1.347 afPond 1P: BIORETENTION-1 Outflow=2.95 cfs 1.272 af Peak Elev=15.50' Storage=2,402 cf Inflow=1.51 cfs 0.184 afPond 7P: BIORETENTION-2 Outflow=0.57 cfs 0.167 af Inflow=3.79 cfs 1.405 afLink 1L: POST BND-1 Primary=3.79 cfs 1.405 af Total Runoff Area = 5.622 ac Runoff Volume = 2.456 af Average Runoff Depth = 5.24" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 56HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 8.08 cfs @ 12.36 hrs, Volume= 0.959 af, Depth= 4.09" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 100YR Rainfall=10.00" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 100YR Rainfall=10.00" Runoff Area=2.810 ac Runoff Volume=0.959 af Runoff Depth=4.09" Flow Length=280' Tc=25.0 min CN=54 8.08 cfs Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 57HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 15.39 cfs @ 12.07 hrs, Volume= 1.179 af, Depth= 8.78" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 100YR Rainfall=10.00" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 100YR Rainfall=10.00" Runoff Area=1.612 ac Runoff Volume=1.179 af Runoff Depth=8.78" Tc=5.0 min CN=90 15.39 cfs Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 58HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 1.29 cfs @ 12.25 hrs, Volume= 0.133 af, Depth= 3.42" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 100YR Rainfall=10.00" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr 100YR Rainfall=10.00" Runoff Area=0.467 ac Runoff Volume=0.133 af Runoff Depth=3.42" Flow Length=168' Tc=16.5 min CN=49 1.29 cfs Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 59HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 1.51 cfs @ 12.36 hrs, Volume= 0.184 af, Depth= 3.02" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 100YR Rainfall=10.00" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr 100YR Rainfall=10.00" Runoff Area=0.733 ac Runoff Volume=0.184 af Runoff Depth=3.02" Flow Length=183' Tc=23.6 min CN=46 1.51 cfs Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 60HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 6.89" for 100YR event Inflow = 15.39 cfs @ 12.07 hrs, Volume= 1.347 af Outflow = 2.95 cfs @ 12.55 hrs, Volume= 1.272 af, Atten= 81%, Lag= 28.6 min Primary = 2.95 cfs @ 12.55 hrs, Volume= 1.272 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 14.11' @ 12.55 hrs Surf.Area= 12,225 sf Storage= 28,042 cf Plug-Flow detention time= 323.1 min calculated for 1.271 af (94% of inflow) Center-of-Mass det. time= 291.1 min ( 1,083.3 - 792.2 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=2.95 cfs @ 12.55 hrs HW=14.11' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 2.95 cfs of 11.66 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.91 cfs @ 6.64 fps) 3=Orifice/Grate (Orifice Controls 1.92 cfs @ 2.51 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.13 cfs) Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 61HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=14.11' Storage=28,042 cf 15.39 cfs 2.95 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 62HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 63HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 3.02" for 100YR event Inflow = 1.51 cfs @ 12.36 hrs, Volume= 0.184 af Outflow = 0.57 cfs @ 12.88 hrs, Volume= 0.167 af, Atten= 62%, Lag= 31.1 min Primary = 0.57 cfs @ 12.88 hrs, Volume= 0.167 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 15.50' @ 12.88 hrs Surf.Area= 3,232 sf Storage= 2,402 cf Plug-Flow detention time= 119.8 min calculated for 0.167 af (91% of inflow) Center-of-Mass det. time= 74.8 min ( 957.5 - 882.7 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.57 cfs @ 12.88 hrs HW=15.50' TW=14.06' (Dynamic Tailwater) 1=Culvert (Passes 0.57 cfs of 9.83 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.53 cfs @ 3.87 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.05 cfs) Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 64HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Inflow Area=0.733 ac Peak Elev=15.50' Storage=2,402 cf 1.51 cfs 0.57 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 65HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 66HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 6.00" for 100YR event Inflow = 3.79 cfs @ 12.45 hrs, Volume= 1.405 af Primary = 3.79 cfs @ 12.45 hrs, Volume= 1.405 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Inflow Area=2.812 ac3.79 cfs 3.79 cfs Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 67HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=4.70"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=9.34 cfs 1.100 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=9.57"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=16.69 cfs 1.286 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=3.97"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=1.52 cfs 0.155 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=3.54"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=1.80 cfs 0.216 af Peak Elev=14.25' Storage=29,736 cf Inflow=16.69 cfs 1.485 afPond 1P: BIORETENTION-1 Outflow=3.67 cfs 1.410 af Peak Elev=15.66' Storage=2,934 cf Inflow=1.80 cfs 0.216 afPond 7P: BIORETENTION-2 Outflow=0.65 cfs 0.199 af Inflow=4.71 cfs 1.564 afLink 1L: POST BND-1 Primary=4.71 cfs 1.564 af Total Runoff Area = 5.622 ac Runoff Volume = 2.757 af Average Runoff Depth = 5.88" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 68HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 9.34 cfs @ 12.36 hrs, Volume= 1.100 af, Depth= 4.70" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr Custom Rainfall=10.80" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr Custom Rainfall=10.80" Runoff Area=2.810 ac Runoff Volume=1.100 af Runoff Depth=4.70" Flow Length=280' Tc=25.0 min CN=54 9.34 cfs Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 69HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 16.69 cfs @ 12.07 hrs, Volume= 1.286 af, Depth= 9.57" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr Custom Rainfall=10.80" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr Custom Rainfall=10.80" Runoff Area=1.612 ac Runoff Volume=1.286 af Runoff Depth=9.57" Tc=5.0 min CN=90 16.69 cfs Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 70HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 1.52 cfs @ 12.24 hrs, Volume= 0.155 af, Depth= 3.97" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr Custom Rainfall=10.80" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr Custom Rainfall=10.80" Runoff Area=0.467 ac Runoff Volume=0.155 af Runoff Depth=3.97" Flow Length=168' Tc=16.5 min CN=49 1.52 cfs Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 71HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 1.80 cfs @ 12.36 hrs, Volume= 0.216 af, Depth= 3.54" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr Custom Rainfall=10.80" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Type III 24-hr Custom Rainfall=10.80" Runoff Area=0.733 ac Runoff Volume=0.216 af Runoff Depth=3.54" Flow Length=183' Tc=23.6 min CN=46 1.80 cfs Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 72HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 7.60" for Custom event Inflow = 16.69 cfs @ 12.07 hrs, Volume= 1.485 af Outflow = 3.67 cfs @ 12.51 hrs, Volume= 1.410 af, Atten= 78%, Lag= 26.3 min Primary = 3.67 cfs @ 12.51 hrs, Volume= 1.410 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 14.25' @ 12.51 hrs Surf.Area= 12,431 sf Storage= 29,736 cf Plug-Flow detention time= 306.0 min calculated for 1.410 af (95% of inflow) Center-of-Mass det. time= 275.2 min ( 1,066.3 - 791.2 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=3.67 cfs @ 12.51 hrs HW=14.25' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 3.67 cfs of 11.93 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.94 cfs @ 6.88 fps) 3=Orifice/Grate (Orifice Controls 2.60 cfs @ 2.78 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.13 cfs) Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 73HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=14.25' Storage=29,736 cf 16.69 cfs 3.67 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 74HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 75HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 3.54" for Custom event Inflow = 1.80 cfs @ 12.36 hrs, Volume= 0.216 af Outflow = 0.65 cfs @ 12.90 hrs, Volume= 0.199 af, Atten= 64%, Lag= 32.3 min Primary = 0.65 cfs @ 12.90 hrs, Volume= 0.199 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 15.66' @ 12.90 hrs Surf.Area= 3,426 sf Storage= 2,934 cf Plug-Flow detention time= 110.9 min calculated for 0.199 af (92% of inflow) Center-of-Mass det. time= 71.6 min ( 949.4 - 877.8 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.65 cfs @ 12.90 hrs HW=15.66' TW=14.15' (Dynamic Tailwater) 1=Culvert (Passes 0.65 cfs of 10.05 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.59 cfs @ 4.32 fps) 3=Orifice/Grate (Orifice Controls 0.01 cfs @ 0.38 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.05 cfs) Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 76HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Inflow Area=0.733 ac Peak Elev=15.66' Storage=2,934 cf 1.80 cfs 0.65 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 77HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 78HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 6.68" for Custom event Inflow = 4.71 cfs @ 12.41 hrs, Volume= 1.564 af Primary = 4.71 cfs @ 12.41 hrs, Volume= 1.564 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 5 4 3 2 1 0 Inflow Area=2.812 ac4.71 cfs 4.71 cfs Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 79HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Subcatchment 1S: PRE DA-1 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002YR 4.50 1.00 0.162 0.69 010YR 7.00 3.76 0.475 2.03 025YR 8.05 5.18 0.634 2.71 050YR 9.00 6.57 0.788 3.37 100YR 10.00 8.08 0.959 4.09 Custom 10.80 9.34 1.100 4.70 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 80HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Subcatchment 2S: POST DA-1 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002YR 4.50 6.27 0.456 3.40 010YR 7.00 10.44 0.782 5.82 025YR 8.05 12.18 0.921 6.85 050YR 9.00 13.75 1.047 7.79 100YR 10.00 15.39 1.179 8.78 Custom 10.80 16.69 1.286 9.57 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 81HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Subcatchment 3S: POST DA-2 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002YR 4.50 0.09 0.018 0.46 010YR 7.00 0.53 0.061 1.58 025YR 8.05 0.78 0.085 2.18 050YR 9.00 1.02 0.108 2.76 100YR 10.00 1.29 0.133 3.42 Custom 10.80 1.52 0.155 3.97 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 82HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Subcatchment 5S: POST DA-3 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002YR 4.50 0.08 0.020 0.33 010YR 7.00 0.56 0.081 1.32 025YR 8.05 0.86 0.114 1.86 050YR 9.00 1.17 0.147 2.41 100YR 10.00 1.51 0.184 3.02 Custom 10.80 1.80 0.216 3.54 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 83HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Pond 1P: BIORETENTION-1 Event Inflow (cfs) Primary (cfs) Elevation (feet) Storage (cubic-feet) 002YR 6.27 0.52 12.65 11,710 010YR 10.44 0.85 13.47 20,555 025YR 12.18 1.42 13.75 23,670 050YR 13.75 2.10 13.93 25,799 100YR 15.39 2.95 14.11 28,042 Custom 16.69 3.67 14.25 29,736 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 84HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Pond 7P: BIORETENTION-2 Event Inflow (cfs) Primary (cfs) Elevation (feet) Storage (cubic-feet) 002YR 0.08 0.01 14.21 824 010YR 0.56 0.19 14.92 1,179 025YR 0.86 0.41 15.17 1,399 050YR 1.17 0.49 15.32 1,823 100YR 1.51 0.57 15.50 2,402 Custom 1.80 0.65 15.66 2,934 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 85HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Link 1L: POST BND-1 Event Inflow (cfs) Primary (cfs) Elevation (feet) 002YR 0.59 0.59 0.00 010YR 1.29 1.29 0.00 025YR 1.76 1.76 0.00 050YR 2.70 2.70 0.00 100YR 3.79 3.79 0.00 Custom 4.71 4.71 0.00 1S PRE DA-1 2S POST DA-1 3S POST DA-2 5S POST DA-3 1P BIORETENTION-1 7P BIORETENTION-2 1L POST BND-1 Routing Diagram for 100403-01-001 HydroCAD model 20240424Prepared by Bowman Consulting Group, Printed 4/24/2024 HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 2HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Rainfall Events Listing Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 002YR Type III 24-hr Default 24.00 1 4.50 2 2 010YR Type III 24-hr Default 24.00 1 7.00 2 3 025YR Type III 24-hr Default 24.00 1 8.05 2 4 050YR Type III 24-hr Default 24.00 1 9.00 2 5 100YR Type III 24-hr Default 24.00 1 10.00 2 6 Custom Type III 24-hr Default 24.00 1 10.80 2 100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 3HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 1.880 39 >75% Grass cover, Good, HSG A (1S) 0.829 40 >75% Grass cover, Good, HSG A (3S, 5S) 0.640 80 >75% Grass cover, Good, HSG D (1S) 0.371 62 >75% Grass cover, Good, HSG D (3S, 5S) 0.230 98 Paved parking, HSG A (1S) 0.060 98 Paved parking, HSG D (1S) 1.115 88 Urban commercial, 85% imp, HSG A (2S) 0.497 95 Urban commercial, 85% imp, HSG D (2S) 5.622 63 TOTAL AREA 100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 4HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 4.054 HSG A 1S, 2S, 3S, 5S 0.000 HSG B 0.000 HSG C 1.568 HSG D 1S, 2S, 3S, 5S 0.000 Other 5.622 TOTAL AREA 100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 5HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 2.709 0.000 0.000 1.011 0.000 3.720 >75% Grass cover, Good 1S, 3S, 5S 0.230 0.000 0.000 0.060 0.000 0.290 Paved parking 1S 1.115 0.000 0.000 0.497 0.000 1.612 Urban commercial, 85% imp 2S 4.054 0.000 0.000 1.568 0.000 5.622 TOTAL AREA 100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 6HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Width (inches) Diam/Height (inches) Inside-Fill (inches) 1 1P 10.00 9.87 40.0 0.0033 0.013 0.0 15.0 0.0 2 7P 12.65 12.35 99.0 0.0030 0.013 0.0 18.0 0.0 Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 7HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=0.69"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=1.00 cfs 0.162 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=3.40"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=6.27 cfs 0.456 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=0.46"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=0.09 cfs 0.018 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=0.33"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=0.08 cfs 0.020 af Peak Elev=12.65' Storage=11,710 cf Inflow=6.27 cfs 0.459 afPond 1P: BIORETENTION-1 Outflow=0.52 cfs 0.395 af Peak Elev=14.21' Storage=824 cf Inflow=0.08 cfs 0.020 afPond 7P: BIORETENTION-2 Outflow=0.01 cfs 0.003 af Inflow=0.59 cfs 0.413 afLink 1L: POST BND-1 Primary=0.59 cfs 0.413 af Total Runoff Area = 5.622 ac Runoff Volume = 0.656 af Average Runoff Depth = 1.40" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 8HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 1.00 cfs @ 12.47 hrs, Volume= 0.162 af, Depth= 0.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 002YR Rainfall=4.50" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr 002YR Rainfall=4.50" Runoff Area=2.810 ac Runoff Volume=0.162 af Runoff Depth=0.69" Flow Length=280' Tc=25.0 min CN=54 1.00 cfs Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 9HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 6.27 cfs @ 12.07 hrs, Volume= 0.456 af, Depth= 3.40" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 002YR Rainfall=4.50" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 7 6 5 4 3 2 1 0 Type III 24-hr 002YR Rainfall=4.50" Runoff Area=1.612 ac Runoff Volume=0.456 af Runoff Depth=3.40" Tc=5.0 min CN=90 6.27 cfs Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 10HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 0.09 cfs @ 12.44 hrs, Volume= 0.018 af, Depth= 0.46" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 002YR Rainfall=4.50" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr 002YR Rainfall=4.50" Runoff Area=0.467 ac Runoff Volume=0.018 af Runoff Depth=0.46" Flow Length=168' Tc=16.5 min CN=49 0.09 cfs Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 11HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 0.08 cfs @ 12.61 hrs, Volume= 0.020 af, Depth= 0.33" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 002YR Rainfall=4.50" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr 002YR Rainfall=4.50" Runoff Area=0.733 ac Runoff Volume=0.020 af Runoff Depth=0.33" Flow Length=183' Tc=23.6 min CN=46 0.08 cfs Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 12HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 2.35" for 002YR event Inflow = 6.27 cfs @ 12.07 hrs, Volume= 0.459 af Outflow = 0.52 cfs @ 13.06 hrs, Volume= 0.395 af, Atten= 92%, Lag= 59.0 min Primary = 0.52 cfs @ 13.06 hrs, Volume= 0.395 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 12.65' @ 13.06 hrs Surf.Area= 10,131 sf Storage= 11,710 cf Plug-Flow detention time= 481.0 min calculated for 0.395 af (86% of inflow) Center-of-Mass det. time= 418.3 min ( 1,216.7 - 798.3 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=0.52 cfs @ 13.06 hrs HW=12.65' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 0.52 cfs of 8.34 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.44 cfs @ 3.20 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.08 cfs) Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 13HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=12.65' Storage=11,710 cf 6.27 cfs 0.52 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 14HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 15HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 0.33" for 002YR event Inflow = 0.08 cfs @ 12.61 hrs, Volume= 0.020 af Outflow = 0.01 cfs @ 24.22 hrs, Volume= 0.003 af, Atten= 91%, Lag= 696.8 min Primary = 0.01 cfs @ 24.22 hrs, Volume= 0.003 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 14.21' @ 24.22 hrs Surf.Area= 1,524 sf Storage= 824 cf Plug-Flow detention time= 760.2 min calculated for 0.003 af (15% of inflow) Center-of-Mass det. time= 539.8 min ( 1,515.9 - 976.0 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.01 cfs @ 24.22 hrs HW=14.21' TW=12.13' (Dynamic Tailwater) 1=Culvert (Passes 0.01 cfs of 6.12 cfs potential flow) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.01 cfs) Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 16HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.733 ac Peak Elev=14.21' Storage=824 cf 0.08 cfs 0.01 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 17HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr 002YR Rainfall=4.50"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 18HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 1.76" for 002YR event Inflow = 0.59 cfs @ 12.53 hrs, Volume= 0.413 af Primary = 0.59 cfs @ 12.53 hrs, Volume= 0.413 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=2.812 ac0.59 cfs 0.59 cfs Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 19HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=2.03"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=3.76 cfs 0.475 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=5.82"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=10.44 cfs 0.782 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=1.58"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=0.53 cfs 0.061 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=1.32"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=0.56 cfs 0.081 af Peak Elev=13.47' Storage=20,555 cf Inflow=10.44 cfs 0.846 afPond 1P: BIORETENTION-1 Outflow=0.85 cfs 0.775 af Peak Elev=14.92' Storage=1,179 cf Inflow=0.56 cfs 0.081 afPond 7P: BIORETENTION-2 Outflow=0.19 cfs 0.063 af Inflow=1.29 cfs 0.836 afLink 1L: POST BND-1 Primary=1.29 cfs 0.836 af Total Runoff Area = 5.622 ac Runoff Volume = 1.400 af Average Runoff Depth = 2.99" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 20HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 3.76 cfs @ 12.39 hrs, Volume= 0.475 af, Depth= 2.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 010YR Rainfall=7.00" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Type III 24-hr 010YR Rainfall=7.00" Runoff Area=2.810 ac Runoff Volume=0.475 af Runoff Depth=2.03" Flow Length=280' Tc=25.0 min CN=54 3.76 cfs Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 21HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 10.44 cfs @ 12.07 hrs, Volume= 0.782 af, Depth= 5.82" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 010YR Rainfall=7.00" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 010YR Rainfall=7.00" Runoff Area=1.612 ac Runoff Volume=0.782 af Runoff Depth=5.82" Tc=5.0 min CN=90 10.44 cfs Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 22HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 0.53 cfs @ 12.27 hrs, Volume= 0.061 af, Depth= 1.58" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 010YR Rainfall=7.00" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 010YR Rainfall=7.00" Runoff Area=0.467 ac Runoff Volume=0.061 af Runoff Depth=1.58" Flow Length=168' Tc=16.5 min CN=49 0.53 cfs Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 23HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 0.56 cfs @ 12.41 hrs, Volume= 0.081 af, Depth= 1.32" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 010YR Rainfall=7.00" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 010YR Rainfall=7.00" Runoff Area=0.733 ac Runoff Volume=0.081 af Runoff Depth=1.32" Flow Length=183' Tc=23.6 min CN=46 0.56 cfs Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 24HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 4.33" for 010YR event Inflow = 10.44 cfs @ 12.07 hrs, Volume= 0.846 af Outflow = 0.85 cfs @ 13.49 hrs, Volume= 0.775 af, Atten= 92%, Lag= 85.4 min Primary = 0.85 cfs @ 13.49 hrs, Volume= 0.775 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 13.47' @ 13.49 hrs Surf.Area= 11,301 sf Storage= 20,555 cf Plug-Flow detention time= 411.9 min calculated for 0.774 af (92% of inflow) Center-of-Mass det. time= 365.6 min ( 1,165.8 - 800.2 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=0.85 cfs @ 13.49 hrs HW=13.47' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 0.85 cfs of 10.35 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.74 cfs @ 5.42 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.11 cfs) Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 25HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=13.47' Storage=20,555 cf 10.44 cfs 0.85 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 26HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 27HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 1.32" for 010YR event Inflow = 0.56 cfs @ 12.41 hrs, Volume= 0.081 af Outflow = 0.19 cfs @ 13.08 hrs, Volume= 0.063 af, Atten= 66%, Lag= 40.3 min Primary = 0.19 cfs @ 13.08 hrs, Volume= 0.063 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 14.92' @ 13.08 hrs Surf.Area= 2,487 sf Storage= 1,179 cf Plug-Flow detention time= 237.6 min calculated for 0.063 af (79% of inflow) Center-of-Mass det. time= 150.5 min ( 1,061.8 - 911.4 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.19 cfs @ 13.08 hrs HW=14.92' TW=13.46' (Dynamic Tailwater) 1=Culvert (Passes 0.19 cfs of 8.45 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.16 cfs @ 1.76 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.03 cfs) Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 28HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.733 ac Peak Elev=14.92' Storage=1,179 cf 0.56 cfs 0.19 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 29HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr 010YR Rainfall=7.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 30HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 3.57" for 010YR event Inflow = 1.29 cfs @ 12.30 hrs, Volume= 0.836 af Primary = 1.29 cfs @ 12.30 hrs, Volume= 0.836 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Inflow Area=2.812 ac1.29 cfs 1.29 cfs Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 31HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=2.71"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=5.18 cfs 0.634 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=6.85"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=12.18 cfs 0.921 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=2.18"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=0.78 cfs 0.085 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=1.86"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=0.86 cfs 0.114 af Peak Elev=13.75' Storage=23,670 cf Inflow=12.18 cfs 1.017 afPond 1P: BIORETENTION-1 Outflow=1.42 cfs 0.945 af Peak Elev=15.17' Storage=1,399 cf Inflow=0.86 cfs 0.114 afPond 7P: BIORETENTION-2 Outflow=0.41 cfs 0.097 af Inflow=1.76 cfs 1.030 afLink 1L: POST BND-1 Primary=1.76 cfs 1.030 af Total Runoff Area = 5.622 ac Runoff Volume = 1.754 af Average Runoff Depth = 3.74" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 32HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 5.18 cfs @ 12.38 hrs, Volume= 0.634 af, Depth= 2.71" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 025YR Rainfall=8.05" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 5 4 3 2 1 0 Type III 24-hr 025YR Rainfall=8.05" Runoff Area=2.810 ac Runoff Volume=0.634 af Runoff Depth=2.71" Flow Length=280' Tc=25.0 min CN=54 5.18 cfs Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 33HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 12.18 cfs @ 12.07 hrs, Volume= 0.921 af, Depth= 6.85" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 025YR Rainfall=8.05" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 025YR Rainfall=8.05" Runoff Area=1.612 ac Runoff Volume=0.921 af Runoff Depth=6.85" Tc=5.0 min CN=90 12.18 cfs Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 34HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 0.78 cfs @ 12.26 hrs, Volume= 0.085 af, Depth= 2.18" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 025YR Rainfall=8.05" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 025YR Rainfall=8.05" Runoff Area=0.467 ac Runoff Volume=0.085 af Runoff Depth=2.18" Flow Length=168' Tc=16.5 min CN=49 0.78 cfs Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 35HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 0.86 cfs @ 12.39 hrs, Volume= 0.114 af, Depth= 1.86" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 025YR Rainfall=8.05" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 025YR Rainfall=8.05" Runoff Area=0.733 ac Runoff Volume=0.114 af Runoff Depth=1.86" Flow Length=183' Tc=23.6 min CN=46 0.86 cfs Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 36HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 5.21" for 025YR event Inflow = 12.18 cfs @ 12.07 hrs, Volume= 1.017 af Outflow = 1.42 cfs @ 13.00 hrs, Volume= 0.945 af, Atten= 88%, Lag= 55.8 min Primary = 1.42 cfs @ 13.00 hrs, Volume= 0.945 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 13.75' @ 13.00 hrs Surf.Area= 11,691 sf Storage= 23,670 cf Plug-Flow detention time= 382.0 min calculated for 0.944 af (93% of inflow) Center-of-Mass det. time= 341.8 min ( 1,138.2 - 796.5 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=1.42 cfs @ 13.00 hrs HW=13.75' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 1.42 cfs of 10.93 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.81 cfs @ 5.97 fps) 3=Orifice/Grate (Orifice Controls 0.49 cfs @ 1.59 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.12 cfs) Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 37HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=13.75' Storage=23,670 cf 12.18 cfs 1.42 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 38HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 39HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 1.86" for 025YR event Inflow = 0.86 cfs @ 12.39 hrs, Volume= 0.114 af Outflow = 0.41 cfs @ 12.83 hrs, Volume= 0.097 af, Atten= 53%, Lag= 26.6 min Primary = 0.41 cfs @ 12.83 hrs, Volume= 0.097 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 15.17' @ 12.83 hrs Surf.Area= 2,832 sf Storage= 1,399 cf Plug-Flow detention time= 171.0 min calculated for 0.097 af (85% of inflow) Center-of-Mass det. time= 104.2 min ( 1,003.0 - 898.8 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.41 cfs @ 12.83 hrs HW=15.17' TW=13.74' (Dynamic Tailwater) 1=Culvert (Passes 0.41 cfs of 9.40 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.37 cfs @ 2.70 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.04 cfs) Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 40HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.733 ac Peak Elev=15.17' Storage=1,399 cf 0.86 cfs 0.41 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 41HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr 025YR Rainfall=8.05"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 42HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 4.39" for 025YR event Inflow = 1.76 cfs @ 12.50 hrs, Volume= 1.030 af Primary = 1.76 cfs @ 12.50 hrs, Volume= 1.030 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Inflow Area=2.812 ac1.76 cfs 1.76 cfs Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 43HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=3.37"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=6.57 cfs 0.788 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=7.79"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=13.75 cfs 1.047 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=2.76"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=1.02 cfs 0.108 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=2.41"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=1.17 cfs 0.147 af Peak Elev=13.93' Storage=25,799 cf Inflow=13.75 cfs 1.176 afPond 1P: BIORETENTION-1 Outflow=2.10 cfs 1.103 af Peak Elev=15.32' Storage=1,823 cf Inflow=1.17 cfs 0.147 afPond 7P: BIORETENTION-2 Outflow=0.49 cfs 0.130 af Inflow=2.70 cfs 1.210 afLink 1L: POST BND-1 Primary=2.70 cfs 1.210 af Total Runoff Area = 5.622 ac Runoff Volume = 2.089 af Average Runoff Depth = 4.46" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 44HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 6.57 cfs @ 12.37 hrs, Volume= 0.788 af, Depth= 3.37" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 050YR Rainfall=9.00" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 7 6 5 4 3 2 1 0 Type III 24-hr 050YR Rainfall=9.00" Runoff Area=2.810 ac Runoff Volume=0.788 af Runoff Depth=3.37" Flow Length=280' Tc=25.0 min CN=54 6.57 cfs Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 45HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 13.75 cfs @ 12.07 hrs, Volume= 1.047 af, Depth= 7.79" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 050YR Rainfall=9.00" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 050YR Rainfall=9.00" Runoff Area=1.612 ac Runoff Volume=1.047 af Runoff Depth=7.79" Tc=5.0 min CN=90 13.75 cfs Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 46HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 1.02 cfs @ 12.25 hrs, Volume= 0.108 af, Depth= 2.76" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 050YR Rainfall=9.00" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr 050YR Rainfall=9.00" Runoff Area=0.467 ac Runoff Volume=0.108 af Runoff Depth=2.76" Flow Length=168' Tc=16.5 min CN=49 1.02 cfs Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 47HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 1.17 cfs @ 12.37 hrs, Volume= 0.147 af, Depth= 2.41" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 050YR Rainfall=9.00" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr 050YR Rainfall=9.00" Runoff Area=0.733 ac Runoff Volume=0.147 af Runoff Depth=2.41" Flow Length=183' Tc=23.6 min CN=46 1.17 cfs Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 48HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 6.02" for 050YR event Inflow = 13.75 cfs @ 12.07 hrs, Volume= 1.176 af Outflow = 2.10 cfs @ 12.65 hrs, Volume= 1.103 af, Atten= 85%, Lag= 34.9 min Primary = 2.10 cfs @ 12.65 hrs, Volume= 1.103 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 13.93' @ 12.65 hrs Surf.Area= 11,951 sf Storage= 25,799 cf Plug-Flow detention time= 350.6 min calculated for 1.102 af (94% of inflow) Center-of-Mass det. time= 314.9 min ( 1,108.9 - 794.0 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=2.10 cfs @ 12.65 hrs HW=13.93' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 2.10 cfs of 11.30 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.86 cfs @ 6.31 fps) 3=Orifice/Grate (Orifice Controls 1.12 cfs @ 2.09 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.12 cfs) Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 49HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=13.93' Storage=25,799 cf 13.75 cfs 2.10 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 50HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 51HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 2.41" for 050YR event Inflow = 1.17 cfs @ 12.37 hrs, Volume= 0.147 af Outflow = 0.49 cfs @ 12.86 hrs, Volume= 0.130 af, Atten= 58%, Lag= 29.2 min Primary = 0.49 cfs @ 12.86 hrs, Volume= 0.130 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 15.32' @ 12.86 hrs Surf.Area= 3,008 sf Storage= 1,823 cf Plug-Flow detention time= 140.1 min calculated for 0.130 af (88% of inflow) Center-of-Mass det. time= 84.4 min ( 974.5 - 890.1 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.49 cfs @ 12.86 hrs HW=15.32' TW=13.92' (Dynamic Tailwater) 1=Culvert (Passes 0.49 cfs of 9.68 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.45 cfs @ 3.27 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.04 cfs) Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 52HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Inflow Area=0.733 ac Peak Elev=15.32' Storage=1,823 cf 1.17 cfs 0.49 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 53HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr 050YR Rainfall=9.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 54HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 5.16" for 050YR event Inflow = 2.70 cfs @ 12.49 hrs, Volume= 1.210 af Primary = 2.70 cfs @ 12.49 hrs, Volume= 1.210 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 3 2 1 0 Inflow Area=2.812 ac2.70 cfs 2.70 cfs Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 55HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=4.09"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=8.08 cfs 0.959 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=8.78"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=15.39 cfs 1.179 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=3.42"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=1.29 cfs 0.133 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=3.02"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=1.51 cfs 0.184 af Peak Elev=14.11' Storage=28,042 cf Inflow=15.39 cfs 1.347 afPond 1P: BIORETENTION-1 Outflow=2.95 cfs 1.272 af Peak Elev=15.50' Storage=2,402 cf Inflow=1.51 cfs 0.184 afPond 7P: BIORETENTION-2 Outflow=0.57 cfs 0.167 af Inflow=3.79 cfs 1.405 afLink 1L: POST BND-1 Primary=3.79 cfs 1.405 af Total Runoff Area = 5.622 ac Runoff Volume = 2.456 af Average Runoff Depth = 5.24" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 56HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 8.08 cfs @ 12.36 hrs, Volume= 0.959 af, Depth= 4.09" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 100YR Rainfall=10.00" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 100YR Rainfall=10.00" Runoff Area=2.810 ac Runoff Volume=0.959 af Runoff Depth=4.09" Flow Length=280' Tc=25.0 min CN=54 8.08 cfs Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 57HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 15.39 cfs @ 12.07 hrs, Volume= 1.179 af, Depth= 8.78" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 100YR Rainfall=10.00" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 100YR Rainfall=10.00" Runoff Area=1.612 ac Runoff Volume=1.179 af Runoff Depth=8.78" Tc=5.0 min CN=90 15.39 cfs Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 58HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 1.29 cfs @ 12.25 hrs, Volume= 0.133 af, Depth= 3.42" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 100YR Rainfall=10.00" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr 100YR Rainfall=10.00" Runoff Area=0.467 ac Runoff Volume=0.133 af Runoff Depth=3.42" Flow Length=168' Tc=16.5 min CN=49 1.29 cfs Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 59HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 1.51 cfs @ 12.36 hrs, Volume= 0.184 af, Depth= 3.02" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr 100YR Rainfall=10.00" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr 100YR Rainfall=10.00" Runoff Area=0.733 ac Runoff Volume=0.184 af Runoff Depth=3.02" Flow Length=183' Tc=23.6 min CN=46 1.51 cfs Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 60HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 6.89" for 100YR event Inflow = 15.39 cfs @ 12.07 hrs, Volume= 1.347 af Outflow = 2.95 cfs @ 12.55 hrs, Volume= 1.272 af, Atten= 81%, Lag= 28.6 min Primary = 2.95 cfs @ 12.55 hrs, Volume= 1.272 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 14.11' @ 12.55 hrs Surf.Area= 12,225 sf Storage= 28,042 cf Plug-Flow detention time= 323.1 min calculated for 1.271 af (94% of inflow) Center-of-Mass det. time= 291.1 min ( 1,083.3 - 792.2 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=2.95 cfs @ 12.55 hrs HW=14.11' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 2.95 cfs of 11.66 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.91 cfs @ 6.64 fps) 3=Orifice/Grate (Orifice Controls 1.92 cfs @ 2.51 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.13 cfs) Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 61HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=14.11' Storage=28,042 cf 15.39 cfs 2.95 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 62HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 63HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 3.02" for 100YR event Inflow = 1.51 cfs @ 12.36 hrs, Volume= 0.184 af Outflow = 0.57 cfs @ 12.88 hrs, Volume= 0.167 af, Atten= 62%, Lag= 31.1 min Primary = 0.57 cfs @ 12.88 hrs, Volume= 0.167 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 15.50' @ 12.88 hrs Surf.Area= 3,232 sf Storage= 2,402 cf Plug-Flow detention time= 119.8 min calculated for 0.167 af (91% of inflow) Center-of-Mass det. time= 74.8 min ( 957.5 - 882.7 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.57 cfs @ 12.88 hrs HW=15.50' TW=14.06' (Dynamic Tailwater) 1=Culvert (Passes 0.57 cfs of 9.83 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.53 cfs @ 3.87 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.05 cfs) Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 64HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Inflow Area=0.733 ac Peak Elev=15.50' Storage=2,402 cf 1.51 cfs 0.57 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 65HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr 100YR Rainfall=10.00"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 66HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 6.00" for 100YR event Inflow = 3.79 cfs @ 12.45 hrs, Volume= 1.405 af Primary = 3.79 cfs @ 12.45 hrs, Volume= 1.405 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Inflow Area=2.812 ac3.79 cfs 3.79 cfs Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 67HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.810 ac 10.32% Impervious Runoff Depth=4.70"Subcatchment 1S: PRE DA-1 Flow Length=280' Tc=25.0 min CN=54 Runoff=9.34 cfs 1.100 af Runoff Area=1.612 ac 85.00% Impervious Runoff Depth=9.57"Subcatchment 2S: POST DA-1 Tc=5.0 min CN=90 Runoff=16.69 cfs 1.286 af Runoff Area=0.467 ac 0.00% Impervious Runoff Depth=3.97"Subcatchment 3S: POST DA-2 Flow Length=168' Tc=16.5 min CN=49 Runoff=1.52 cfs 0.155 af Runoff Area=0.733 ac 0.00% Impervious Runoff Depth=3.54"Subcatchment 5S: POST DA-3 Flow Length=183' Tc=23.6 min CN=46 Runoff=1.80 cfs 0.216 af Peak Elev=14.25' Storage=29,736 cf Inflow=16.69 cfs 1.485 afPond 1P: BIORETENTION-1 Outflow=3.67 cfs 1.410 af Peak Elev=15.66' Storage=2,934 cf Inflow=1.80 cfs 0.216 afPond 7P: BIORETENTION-2 Outflow=0.65 cfs 0.199 af Inflow=4.71 cfs 1.564 afLink 1L: POST BND-1 Primary=4.71 cfs 1.564 af Total Runoff Area = 5.622 ac Runoff Volume = 2.757 af Average Runoff Depth = 5.88" 70.47% Pervious = 3.962 ac 29.53% Impervious = 1.660 ac Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 68HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE DA-1 Runoff = 9.34 cfs @ 12.36 hrs, Volume= 1.100 af, Depth= 4.70" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr Custom Rainfall=10.80" Area (ac) CN Description 0.230 98 Paved parking, HSG A 1.880 39 >75% Grass cover, Good, HSG A 0.060 98 Paved parking, HSG D 0.640 80 >75% Grass cover, Good, HSG D 2.810 54 Weighted Average 2.520 89.68% Pervious Area 0.290 10.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.0 78 0.0039 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 4.50" 6.0 202 0.0500 0.56 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 25.0 280 Total Subcatchment 1S: PRE DA-1 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr Custom Rainfall=10.80" Runoff Area=2.810 ac Runoff Volume=1.100 af Runoff Depth=4.70" Flow Length=280' Tc=25.0 min CN=54 9.34 cfs Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 69HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: POST DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 16.69 cfs @ 12.07 hrs, Volume= 1.286 af, Depth= 9.57" Routed to Pond 1P : BIORETENTION-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr Custom Rainfall=10.80" Area (ac) CN Description * 1.115 88 Urban commercial, 85% imp, HSG A 0.497 95 Urban commercial, 85% imp, HSG D 1.612 90 Weighted Average 0.242 15.00% Pervious Area 1.370 85.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2S: POST DA-1 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr Custom Rainfall=10.80" Runoff Area=1.612 ac Runoff Volume=1.286 af Runoff Depth=9.57" Tc=5.0 min CN=90 16.69 cfs Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 70HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST DA-2 Runoff = 1.52 cfs @ 12.24 hrs, Volume= 0.155 af, Depth= 3.97" Routed to Link 1L : POST BND-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr Custom Rainfall=10.80" Area (ac) CN Description * 0.281 40 >75% Grass cover, Good, HSG A * 0.186 62 >75% Grass cover, Good, HSG D 0.467 49 Weighted Average 0.467 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.3 100 0.0320 0.11 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 1.2 68 0.1440 0.95 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 16.5 168 Total Subcatchment 3S: POST DA-2 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type III 24-hr Custom Rainfall=10.80" Runoff Area=0.467 ac Runoff Volume=0.155 af Runoff Depth=3.97" Flow Length=168' Tc=16.5 min CN=49 1.52 cfs Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 71HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST DA-3 Runoff = 1.80 cfs @ 12.36 hrs, Volume= 0.216 af, Depth= 3.54" Routed to Pond 7P : BIORETENTION-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type III 24-hr Custom Rainfall=10.80" Area (ac) CN Description * 0.548 40 >75% Grass cover, Good, HSG A * 0.185 62 >75% Grass cover, Good, HSG D 0.733 46 Weighted Average 0.733 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 100 0.0190 0.09 Sheet Flow, Grass: Bermuda n= 0.410 P2= 4.50" 4.7 83 0.0140 0.30 Shallow Concentrated Flow, Forest w/Heavy Litter Kv= 2.5 fps 23.6 183 Total Subcatchment 5S: POST DA-3 Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Type III 24-hr Custom Rainfall=10.80" Runoff Area=0.733 ac Runoff Volume=0.216 af Runoff Depth=3.54" Flow Length=183' Tc=23.6 min CN=46 1.80 cfs Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 72HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: BIORETENTION-1 Inflow Area = 2.345 ac, 58.43% Impervious, Inflow Depth = 7.60" for Custom event Inflow = 16.69 cfs @ 12.07 hrs, Volume= 1.485 af Outflow = 3.67 cfs @ 12.51 hrs, Volume= 1.410 af, Atten= 78%, Lag= 26.3 min Primary = 3.67 cfs @ 12.51 hrs, Volume= 1.410 af Routed to Link 1L : POST BND-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 14.25' @ 12.51 hrs Surf.Area= 12,431 sf Storage= 29,736 cf Plug-Flow detention time= 306.0 min calculated for 1.410 af (95% of inflow) Center-of-Mass det. time= 275.2 min ( 1,066.3 - 791.2 ) Volume Invert Avail.Storage Storage Description #1 10.00' 53,829 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 10.00 6,671 0.0 0 0 11.00 7,918 45.0 3,283 3,283 12.00 9,234 25.0 2,144 5,427 13.00 10,616 100.0 9,925 15,352 14.00 12,058 100.0 11,337 26,689 15.00 13,556 100.0 12,807 39,496 16.00 15,111 100.0 14,334 53,829 Device Routing Invert Outlet Devices #1 Primary 10.00'15.0" Round RCP_Round 15" L= 40.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 10.00' / 9.87' S= 0.0033 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf #2 Device 1 12.00'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 13.50'15.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 15.75'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 10.00'1.000 in/hr Exfiltration over Horizontal area above 10.00' Excluded Horizontal area = 6,671 sf Phase-In= 0.01' Primary OutFlow Max=3.67 cfs @ 12.51 hrs HW=14.25' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 3.67 cfs of 11.93 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.94 cfs @ 6.88 fps) 3=Orifice/Grate (Orifice Controls 2.60 cfs @ 2.78 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.13 cfs) Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 73HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.345 ac Peak Elev=14.25' Storage=29,736 cf 16.69 cfs 3.67 cfs Pond 1P: BIORETENTION-1 Primary Stage-Discharge Discharge (cfs) 14131211109876543210 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 RCP_Round 15" + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 74HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 1P: BIORETENTION-1 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)50,00040,00030,00020,00010,0000 Surface/Horizontal/Wetted Area (sq-ft)15,00014,00013,00012,00011,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 El e v a t i o n ( f e e t ) 16 15 14 13 12 11 10 Custom Stage Data Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 75HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION-2 Inflow Area = 0.733 ac, 0.00% Impervious, Inflow Depth = 3.54" for Custom event Inflow = 1.80 cfs @ 12.36 hrs, Volume= 0.216 af Outflow = 0.65 cfs @ 12.90 hrs, Volume= 0.199 af, Atten= 64%, Lag= 32.3 min Primary = 0.65 cfs @ 12.90 hrs, Volume= 0.199 af Routed to Pond 1P : BIORETENTION-1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 15.66' @ 12.90 hrs Surf.Area= 3,426 sf Storage= 2,934 cf Plug-Flow detention time= 110.9 min calculated for 0.199 af (92% of inflow) Center-of-Mass det. time= 71.6 min ( 949.4 - 877.8 ) Volume Invert Avail.Storage Storage Description #1 12.65' 6,220 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 12.65 1,237 0.0 0 0 13.65 1,237 45.0 557 557 14.00 1,237 45.0 195 751 15.15 2,803 25.0 581 1,332 16.50 4,438 100.0 4,888 6,220 Device Routing Invert Outlet Devices #1 Primary 12.65'18.0" Round Culvert L= 99.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 12.65' / 12.35' S= 0.0030 '/' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.77 sf #2 Device 1 14.65'5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 15.65'15.0" W x 7.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 16.45'24.0" x 36.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 12.65'1.000 in/hr Exfiltration over Horizontal area above 12.65' Excluded Horizontal area = 1,237 sf Phase-In= 0.01' Primary OutFlow Max=0.65 cfs @ 12.90 hrs HW=15.66' TW=14.15' (Dynamic Tailwater) 1=Culvert (Passes 0.65 cfs of 10.05 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.59 cfs @ 4.32 fps) 3=Orifice/Grate (Orifice Controls 0.01 cfs @ 0.38 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Exfiltration (Exfiltration Controls 0.05 cfs) Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 76HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Inflow Area=0.733 ac Peak Elev=15.66' Storage=2,934 cf 1.80 cfs 0.65 cfs Pond 7P: BIORETENTION-2 Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 16 15 14 13 Culvert + Exfiltration Orifice/Grate Orifice/Grate Orifice/Grate Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 77HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION-2 Surface Horizontal Storage Stage-Area-Storage Storage (cubic-feet)6,0005,0004,0003,0002,0001,0000 Surface/Horizontal/Wetted Area (sq-ft)4,0003,5003,0002,5002,0001,5001,0005000 El e v a t i o n ( f e e t ) 16 15 14 13 Custom Stage Data Type III 24-hr Custom Rainfall=10.80"100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 78HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Summary for Link 1L: POST BND-1 Inflow Area = 2.812 ac, 48.73% Impervious, Inflow Depth > 6.68" for Custom event Inflow = 4.71 cfs @ 12.41 hrs, Volume= 1.564 af Primary = 4.71 cfs @ 12.41 hrs, Volume= 1.564 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Link 1L: POST BND-1 InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 5 4 3 2 1 0 Inflow Area=2.812 ac4.71 cfs 4.71 cfs Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 79HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Subcatchment 1S: PRE DA-1 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002YR 4.50 1.00 0.162 0.69 010YR 7.00 3.76 0.475 2.03 025YR 8.05 5.18 0.634 2.71 050YR 9.00 6.57 0.788 3.37 100YR 10.00 8.08 0.959 4.09 Custom 10.80 9.34 1.100 4.70 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 80HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Subcatchment 2S: POST DA-1 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002YR 4.50 6.27 0.456 3.40 010YR 7.00 10.44 0.782 5.82 025YR 8.05 12.18 0.921 6.85 050YR 9.00 13.75 1.047 7.79 100YR 10.00 15.39 1.179 8.78 Custom 10.80 16.69 1.286 9.57 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 81HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Subcatchment 3S: POST DA-2 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002YR 4.50 0.09 0.018 0.46 010YR 7.00 0.53 0.061 1.58 025YR 8.05 0.78 0.085 2.18 050YR 9.00 1.02 0.108 2.76 100YR 10.00 1.29 0.133 3.42 Custom 10.80 1.52 0.155 3.97 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 82HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Subcatchment 5S: POST DA-3 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002YR 4.50 0.08 0.020 0.33 010YR 7.00 0.56 0.081 1.32 025YR 8.05 0.86 0.114 1.86 050YR 9.00 1.17 0.147 2.41 100YR 10.00 1.51 0.184 3.02 Custom 10.80 1.80 0.216 3.54 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 83HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Pond 1P: BIORETENTION-1 Event Inflow (cfs) Primary (cfs) Elevation (feet) Storage (cubic-feet) 002YR 6.27 0.52 12.65 11,710 010YR 10.44 0.85 13.47 20,555 025YR 12.18 1.42 13.75 23,670 050YR 13.75 2.10 13.93 25,799 100YR 15.39 2.95 14.11 28,042 Custom 16.69 3.67 14.25 29,736 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 84HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Pond 7P: BIORETENTION-2 Event Inflow (cfs) Primary (cfs) Elevation (feet) Storage (cubic-feet) 002YR 0.08 0.01 14.21 824 010YR 0.56 0.19 14.92 1,179 025YR 0.86 0.41 15.17 1,399 050YR 1.17 0.49 15.32 1,823 100YR 1.51 0.57 15.50 2,402 Custom 1.80 0.65 15.66 2,934 Multi-Event Tables100403-01-001 HydroCAD model 20240424 Printed 4/24/2024Prepared by Bowman Consulting Group Page 85HydroCAD® 10.20-2g s/n 10232 © 2022 HydroCAD Software Solutions LLC Events for Link 1L: POST BND-1 Event Inflow (cfs) Primary (cfs) Elevation (feet) 002YR 0.59 0.59 0.00 010YR 1.29 1.29 0.00 025YR 1.76 1.76 0.00 050YR 2.70 2.70 0.00 100YR 3.79 3.79 0.00 Custom 4.71 4.71 0.00 ROYAL FARMS STORE #482 – WILMINGTON, NEW HANOVER COUNTY, NC APPENDIX C Water Quality Calculations PROJECT NO : Royal Farm Store # 482 Wilmington, NC Designed by: ND DATE: 04/25/24 Checked by: ELEVATION AREA AVERAGE STORAGE INTERVAL CUMUL.CUMUL.ROUTING AREA INTERVAL VOLUME VOLUME VOLUME VOLUME (FT.)(SF.)(SF.)(FT.)(CF.)(CF.)(AC-FT) (AC-FT) 10.00 6,671 - 0.00 0.00 7,295 1.00 7,295 11.00 7,918 7,295 0.17 0.00 8,576 1.00 8,576 12.00 9,234 15,871 0.36 0.00 .9,925 1.00 9,925 13.00 10,616 25,796 0.59 0.00 .11,337 1.00 11,337 14.00 12,058 37,133 0.85 0.00 12,807 1.00 12,807 15.00 13,556 49,940 1.15 0.00 14,334 1.00 14,334 16.00 15,111 64,273 1.48 0.00 WQ req'd 8,592 11.01 WQ elev STAGE STORAGE VOLUME CHART Stormwater Management Bioretention 1 2 4 6 8 10 12 14 EL E V A T I O N ELEVATION-STORAGE CURVE V:\100403 - Royal Farms Store # 482 Wilminton NC\100403-01-001 (ENG)\Engineering\Design Documents\Stormwater\Calcs\Pond Stage Storage 20240418.xlsx PROJECT NO : Royal Farm Store # 482 Wilmington, NC Designed by: ND DATE: 04/25/24 Checked by: ELEVATION AREA AVERAGE STORAGE INTERVAL CUMUL.CUMUL.ROUTING AREA INTERVAL VOLUME VOLUME VOLUME VOLUME (FT.)(SF.)(SF.)(FT.)(CF.)(CF.)(AC-FT) (AC-FT) 14.00 1,250 - 0.00 0.00 2,033 1.00 2,033 15.00 2,815 2,033 0.05 0.00 3,633 1.50 5,449 16.50 4,450 7,482 0.17 0.00 . WQ req'd 1,325 13.56 WQ elev STAGE STORAGE VOLUME CHART Stormwater Management Bioretention 2 14 14.5 15 15.5 16 16.5 17 EL E V A T I O N ELEVATION-STORAGE CURVE V:\100403 - Royal Farms Store # 482 Wilminton NC\100403-01-001 (ENG)\Engineering\Design Documents\Stormwater\Calcs\Pond Stage Storage 20240418.xlsx Bioretention-1 Cd 0.6 Orifice Width, in 1 Orifice Quantity 1 Orifice Invert El, ft 10 Pond Water Quality El, ft 10.40 Water Quality Vol, ft3 2922.15 Orifice CL, ft 10.04 Avg h, ft 0.18 Orifice Area, ft2 0.0055 q, ft3/sec 0.0111 Detention time, hr 72.96 Total Drainage Area 1.61 WQ Vol (cf)2922.15 WQ Elev 10.40 Elev Area (sf) Cum Vol (cf) Area (ac) Pond Bottom 10 6671 0 0.153145 Next Contour 11 7918 7295 0.181772 12 9234 15871 0.211983 13 10616 25796 0.24371 14 12058 37133 0.276814 15 13556 49940 0.311203 16 15111 64273 0.346901 Bioretention Data Bioretention-2 Cd 0.6 Orifice Width, in 1 Orifice Quantity 1 Orifice Invert El, ft 14 Pond Water Quality El, ft 14.36 Water Quality Vol, ft3 1324.95 Orifice CL, ft 14.04 Avg h, ft 0.16 Orifice Area, ft2 0.0055 q, ft3/sec 0.0106 Detention time, hr 34.87 Total Drainage Area 0.73 WQ Vol (cf)1324.95 WQ Elev 14.36 Elev Area (sf) Cum Vol (cf) Area (ac) Pond Bottom 14 4450 0 0.102158 Next Contour 15 2815 3633 0.064624 16.5 1250 6681 0.028696 Bioretention Data BOWMAN CONSULTING GROUP Site Name:Date: Project #: By: County: Checked: DA1 Water Quality 1.61 ac 0.00252 sq-mi Measured Areas: Pond A B C D Total 0.034 0.03 ac 1.125 1.13 ac 0.453 0.45 ac 1.612 1.612 ac 1.578 ac Percent Impervious (I) =98.0% Compute Target WQV Target WQv for 0.5" over total area 0.5 * A 12 0.07 ac-ft Target WQv for 1.5" over imperivous area 1.5 * A 12 0.20 ac-ft 0.20 ac-ft 8,592 cf Stormwater Management - Environmental Site Design - Bioretention Cell 1 Target WQV = Royal Farms #482 April 25, 2024 100403-01-001 ND New Hanover County, NC JJ Total Drainage Area: Bioretention Total Impervious Area = Open/Woods Impervious WQV Required: WQV Provided: Target WQV = BOWMAN CONSULTING GROUP Site Name:Date: Project #: By: County: Checked: DA1 Water Quality 0.47 ac 0.00073 sq-mi Measured Areas: Pond A B C D Total 0.467 0.47 ac 0.000 0.00 ac 0.000 0.00 ac 0.467 0.467 ac 0.000 ac Percent Impervious (I) =0.0% Compute Target WQV Target WQv for 0.5" over total area 0.5 * A 12 0.02 ac-ft Target WQv for 1.5" over imperivous area 1.5 * A 12 0.00 ac-ft 0.02 ac-ft 853 cf Total Royal Farms #482 April 25, 2024 100403-01-001 ND New Hanover County, NC JJ Stormwater Management - Environmental Site Design Drainage Area: Open/Woods Impervious Bioretention Total Impervious Area = Target WQV = Target WQV = WQV Required: WQV Provided: BOWMAN CONSULTING GROUP Site Name:Date: Project #: By: County: Checked: DA1 Water Quality 0.73 ac 0.00114 sq-mi Measured Areas: Pond A B C D Total 0.684 0.68 ac 0.049 0.05 ac 0.000 0.00 ac 0.733 0.733 ac 0.049 ac Percent Impervious (I) =6.7% Compute Target WQV Target WQv for 0.5" over total area 0.5 * A 12 0.03 ac-ft Target WQv for 1.5" over imperivous area 1.5 * A 12 0.01 ac-ft 0.03 ac-ft 1,325 cf Total Royal Farms #482 April 25, 2024 100403-01-001 ND New Hanover County, NC JJ Stormwater Management - Environmental Site Design - Bioretention Cell 2 Drainage Area: Open/Woods Impervious Bioretention Total Impervious Area = Target WQV = Target WQV = WQV Required: WQV Provided: PROJECT NO :100403-Royal Farms #482 Designed by:ND DATE:04/24/24 Checked by: ELEVATION AREA AVERAGE STORAGE INTERVAL CUMUL.CUMUL.ROUTING AREA INTERVAL VOLUME VOLUME VOLUME VOLUME (FT.)(SF.)(SF.)(FT.)(CF.)(CF.)(AC-FT) (AC-FT) 13.00 10,616 - 0.00 0.00 11,337 1.00 11,337 14.00 12,058 11,337 0.26 0.00 12,807 1.00 12,807 15.00 13,556 24,144 0.55 0.00 14,334 1.00 14,334 16.00 15,111 38,478 0.88 0.00 Forebay Required Size: 1.5" over the contributing impervious area Contributing areas: DA1 1.610 70,132 sf imperv area (1.5/12) * 70132 =8,766 cf sediment storage required STAGE STORAGE VOLUME CHART Bioretention Cell 1 Forebay 0 2 4 6 8 10 12 14 16 18 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 EL E V A T I O N STORAGE (AC-FT) ELEVATION-STORAGE CURVE V:\100403 - Royal Farms Store # 482 Wilminton NC\100403-01-001 (ENG)\Engineering\Design Documents\Stormwater\Calcs\Forebay .xls ROYAL FARMS STORE #482 – WILMINGTON, NEW HANOVER COUNTY, NC APPENDIX D Sediment Control Cross Section for Diversion Ditch Project Description ManningFormulaFriction Method DischargeSolve For Input Data 0.020Roughness Coefficient ft/ft0.050Channel Slope in18.0Normal Depth H:V2.000Left Side Slope H:V2.000Right Side Slope ft2.00Bottom Width cfs112.79Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 9/22/2023 FlowMaster [10.03.00.03] Bentley Systems, Inc. Haestad Methods Solution CenterDiversion Ditch Calcs.fm8 Page 141 of 167 This structure is intended for less than 3 years of use. Structures intended for more than 3 years of use should be desinged as permanent structures. User Input Data Calculated Value Reference Data Designed By:ND Date: Checked By:BW Date: Company:BOWMAN Project Name:ROYAL FARMS #482 Project No.:100403-01-001 Site Location (City/Town)Castle Hayne, NC Sediment Basin Id. Total Drainage Area (acres)2.81 Q10 (cfs) 1.03 Minimum pool elevation (ft) 10 Maximum pool elevation (ft) 16 Disturbed acreage (ac) 2.81 Min Volume (ft3)5058 Sediment cleanout elevation (ft) 14 Sediment Storage Area 15111 Length/width ratio 5 Is length/width ratio between 2-6? YES, PROCEED Basin surface area @ principal spillway (ft2)13556 Ratio: basin surface area/Q10 13161.16505 Is ratio >= 435 ft2/cfs?YES Weir coefficient, C 3.1 Riser circumference, L (ft) 3 Head above riser crest, H (ft) 2 Qw (cfs)26.30437226 Orifice coefficient, Co 0.6 Riser cross-sectional area, A (ft2) 9 Accleration due to gravity, g (ft/s2) 32.2 Head above riser crest, H (ft) 1 Discharge, Qo (cfs)43.33478972 Barrel diameter (ft) 1.25 Barrel cross-sectional area, a (ft2) 1.2 Accleration due to gravity, g (ft/s2) 32.2 Head above outlet end of barrel, h (ft) 8 Minor loss coefficieint, Km 1.0 Barrel length, L (ft) 40 8.07a Mannings coeffienct of roughness, n 0.015 Inside diameter of barrel, di (in)15 Pipe friction coefficient, Kp 0.03094 Discharge, Qo (cfs)15.48052929 19.6962177 Table 8.07b Weight of water displaced by the empty riser 141139173 Buoyant weight 155253090.3 Discharge velocity, V (ft/s) 12.61467012 16.0499221 See Appendix 8.06 for riprap sizing, if necessary Table 8.07c Table 8.07d 8.07c 8.07d Q10 1.03 Qp 15.48052929 Emergency spillway capacity, Qe (cfs)-14.45052929 Qp + Qe 1.03 Does (Qp + Qe) equal or exceed Q10? YES, PROCEED Width of control section (ft) 3 Width of entrance (ft) 1.5 Slope of approach channel (%) 2 Is width of the entrance section 1.5xcontrol section width?YES, PROCEED Is approach channel >/= 2%? YES, PROCEED OPTION 1 Faircloth Skimmer Sizing Skimmer FLOW CAPACITIES (IN CU. FT.) FOR THE FAIRCLOTH SKIMMER® Skimmer size 1.5" 2" 2.5" 3" 4" 5" 6" 8" 24 hours 1,728 3,283 6,234 9,774 20,109 32,832 51,840 97,978 2 day 3,456 6,566 12,468 19,548 40,218 65,664 103,680 195,956 3 day 5,184 9,849 18,702 29,322 60,327 98,496 155,520 293,934 4 day 6,912 13,132 24,936 39,096 80,436 131,328 207,360 391,912 5 day 8,640 16,415 31,170 48,870 100,545 164,160 259,200 489,890 6 day 10,368 19,698 37,404 58,644 120,654 196,992 311,040 587,868 7 day 12,096 22,981 43,638 68,418 140,763 229,824 362,880 685,846 User Input Data Calculated Value Reference Data Designed By:ND Date:4/25/2024 Checked By:JJ Date:------ Company:Bowman Project Name:Royal Farms #482 Project No.:100403-01-001 Site Location (City/Town)Wilmington, NC Culvert Id. Bioretention Outlet Pipe Total Drainage Area (acres) Rational Method for Flow Outlet pipe diameter, Do (in.)15 **use max TW for desgin Tailwater depth (in.) 15 Minimum/Maximum tailwater? Max TW (Fig. 8.06b) Discharge (cfs) 2.95 Velocity (ft./s) 1.05 <---discharge / area **use max TW for desgin Minimum TW Maximum TW Figure 8.06a Figure 8.06b Riprap d50, (ft.)0.1 Minimum apron length, La (ft.)6 Apron width at pipe outlet (ft.) 3.75 Apron shape Apron width at outlet end (ft.) 3.65 Minimum TW Maximum TW Max Stone Diameter, dmax (ft.) 0 0.15 Minimum TW Maximum TW Apron Thickness(ft.) 0 0.225 User Input Data Calculated Value Reference Data Designed By:ND Date:4/25/2024 Checked By:JJ Date:------ Company:Bowman Project Name:Royal Farms #482 Project No.:100403-01-001 Site Location (City/Town)Wilmington, NC Culvert Id. Bioretention Inlet Pipe Total Drainage Area (acres) Rational Method for Flow Outlet pipe diameter, Do (in.)24 Tailwater depth (in.) 24 Minimum/Maximum tailwater? Max TW (Fig. 8.06b) Discharge (cfs) 18.29 Velocity (ft./s) 7.81 **use max TW for desgin Minimum TW Maximum TW Figure 8.06a Figure 8.06b Riprap d50, (ft.)0.2 Minimum apron length, La (ft.)9.5 Apron width at pipe outlet (ft.) 6 Apron shape Apron width at outlet end (ft.) 5.8 Minimum TW Maximum TW Max Stone Diameter, dmax (ft.) 0 0.3 Minimum TW Maximum TW Apron Thickness(ft.) 0 0.45 User Input Data Calculated Value Reference Data Designed By:ND Date:4/25/2024 Checked By:JJ Date:------ Company:Bowman Project Name:Royal Farms #482 Project No.:100403-01-001 Site Location (City/Town)Wilmington, NC Culvert Id.Offsite 1 Outlet Pipe Total Drainage Area (acres) Rational Method for Flow Outlet pipe diameter, Do (in.)18 Tailwater depth (in.) 18 Minimum/Maximum tailwater? Max TW (Fig. 8.06b) Discharge (cfs) 0.4 Velocity (ft./s) 0.23 **use max TW for desgin Minimum TW Maximum TW Figure 8.06a Figure 8.06b Riprap d50, (ft.)0.1 Minimum apron length, La (ft.)8 Apron width at pipe outlet (ft.) 4.5 Apron shape Apron width at outlet end (ft.) 4.7 Minimum TW Maximum TW Max Stone Diameter, dmax (ft.) 0 0.15 Minimum TW Maximum TW Apron Thickness(ft.) 0 0.225 Figure 8.06a: Design of outlet protection from a round pipe flowing full, minimum tailwater condition (Tw<0.5 diameter) Figure 8.06b: Design of outlet protection from a round pipe flowing full, maximum tailwater condition (Tw>=0.5 diameter) Channel Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Wednesday, Sep 20 2023 EX. 60in Pipe Circular Diameter (ft) = 5.00 Invert Elev (ft) = 4.79 Slope (%) = 0.56 N-Value = 0.023 Calculations Compute by: Q vs Depth No. Increments = 25 Highlighted Depth (ft) = 0.20 Q (cfs) = 0.336 Area (sqft) = 0.27 Velocity (ft/s) = 1.25 Wetted Perim (ft) = 2.02 Crit Depth, Yc (ft) = 0.16 Top Width (ft) = 1.97 EGL (ft) = 0.22 0 1 2 3 4 5 6 7 Elev (ft) Depth (ft)Section 3.00 -1.79 4.00 -0.79 5.00 0.21 6.00 1.21 7.00 2.21 8.00 3.21 9.00 4.21 10.00 5.21 Reach (ft) Page 162 of 167 Hydraflow Express - EX. 60in Pipe - 09/20/23 1 Depth Q Area Veloc Wp (ft)(cfs)(sqft)(ft/s)(ft) 0.20 0.336 0.268 1.25 2.02 0.40 1.451 0.741 1.96 2.87 0.60 3.416 1.348 2.53 3.55 0.80 6.172 2.041 3.02 4.12 1.00 9.751 2.817 3.46 4.65 1.20 13.96 3.633 3.84 5.12 1.40 19.15 4.549 4.21 5.60 1.60 24.60 5.444 4.52 6.02 1.80 30.77 6.398 4.81 6.45 2.00 37.17 7.341 5.06 6.85 2.20 44.49 8.376 5.31 7.27 2.40 51.75 9.370 5.52 7.67 2.60 59.24 10.37 5.71 8.07 2.80 66.80 11.36 5.88 8.47 3.00 74.28 12.33 6.02 8.87 3.20 81.53 13.28 6.14 9.27 3.40 88.82 14.23 6.24 9.70 3.60 95.90 15.17 6.32 10.15 3.80 102.2 16.03 6.37 10.60 4.00 107.7 16.85 6.40 11.08 4.20 112.6 17.62 6.39 11.60 4.40 116.2 18.31 6.35 12.18 4.60 118.3 18.91 6.26 12.85 4.80 118.0 19.37 6.09 13.70 5.00 110.2 19.63 5.61 15.71 Page 163 of 167 Hydraflow Express - EX. 60in Pipe - 09/20/23 2 Yc TopWidth Energy (ft)(ft)(ft) 0.16 1.97 0.22 0.33 2.72 0.46 0.51 3.26 0.70 0.68 3.67 0.94 0.86 4.01 1.19 1.03 4.27 1.43 1.21 4.50 1.68 1.37 4.67 1.92 1.54 4.80 2.16 1.69 4.90 2.40 1.86 4.97 2.64 2.02 5.00 2.87 2.17 5.00 3.11 2.30 4.96 3.34 2.44 4.90 3.56 2.55 4.80 3.79 2.68 4.66 4.01 2.79 4.48 4.22 2.88 4.26 4.43 2.96 4.00 4.64 3.02 3.66 4.83 3.07 3.25 5.03 3.11 2.70 5.21 3.10 1.95 5.38 3.00 0.00 5.49 Page 164 of 167 880 Island Park Drive, Suite 400, Charleston, South Carolina 29492 843.501.0333 | bowman.com Gutter Spread Calculations