JMA02P003 262 270 Main Street Development Stormwater Management Report

Proposed Flows NOAA10 24-hr D 2-Year-Current Rainfall=3.43" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Pond 2P: Basin A Stage-Discharge Total Discarded Primary 98 Broad-Crested Rectangular Weir Elevation (feet) 97 Orifice/Grate 96 Exfiltration 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Discharge (cfs)

Proposed Flows NOAA10 24-hr D 2-Year-Current Rainfall=3.43" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Pond 2P: Basin A Stage-Area-Storage Surface/Horizontal/Wetted Area (sq-ft) 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 Surface Storage 98 Elevation (feet) 97 Cultec R-180HD 96 Field A 0 500 1,000 1,500 2,000 2,500 3,000 Storage (cubic-feet)

Proposed Flows NOAA10 24-hr D 2-Year-Current Rainfall=3.43" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Hydrograph for Pond 2P: Basin A Time Inflow Storage Elevation Outflow Discarded Primary (hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 95.70 0.00 0.00 0.00 2.50 0.01 8 95.71 0.01 0.01 0.00 5.00 0.02 18 95.72 0.02 0.02 0.00 7.50 0.03 31 95.74 0.02 0.02 0.00 10.00 0.05 135 95.86 0.02 0.02 0.00 12.50 0.12 1,498 96.81 0.08 0.02 0.05 15.00 0.04 1,396 96.75 0.06 0.02 0.03 17.50 0.03 1,275 96.68 0.04 0.02 0.01 20.00 0.02 1,216 96.65 0.03 0.02 0.00 22.50 0.02 1,154 96.61 0.03 0.02 0.00 25.00 0.00 1,012 96.53 0.02 0.02 0.00 27.50 0.00 789 96.40 0.02 0.02 0.00 30.00 0.00 566 96.28 0.02 0.02 0.00 32.50 0.00 343 96.10 0.02 0.02 0.00 35.00 0.00 120 95.84 0.02 0.02 0.00 37.50 0.00 0 95.70 0.00 0.00 0.00 40.00 0.00 0 95.70 0.00 0.00 0.00 42.50 0.00 0 95.70 0.00 0.00 0.00 45.00 0.00 0 95.70 0.00

0 95.70 0.00 0.00 0.00 42.50 0.00 0 95.70 0.00 0.00 0.00 45.00 0.00 0 95.70 0.00 0.00 0.00 47.50 0.00 0 95.70 0.00 0.00 0.00 50.00 0.00 0 95.70 0.00 0.00 0.00 52.50 0.00 0 95.70 0.00 0.00 0.00 55.00 0.00 0 95.70 0.00 0.00 0.00 57.50 0.00 0 95.70 0.00 0.00 0.00 60.00 0.00 0 95.70 0.00 0.00 0.00 62.50 0.00 0 95.70 0.00 0.00 0.00 65.00 0.00 0 95.70 0.00 0.00 0.00 67.50 0.00 0 95.70 0.00 0.00 0.00 70.00 0.00 0 95.70 0.00 0.00 0.00

Proposed Flows NOAA10 24-hr D 2-Year-Current Rainfall=3.43" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Summary for Pond 5P: Porous Pavement B Inflow Area = 16,284 sf, 94.43% Impervious, Inflow Depth = 3.09" for 2-Year-Current event Inflow = 1.41 cfs @ 12.06 hrs, Volume= 4,186 cf Outflow = 0.07 cfs @ 13.47 hrs, Volume= 4,186 cf, Atten= 95%, Lag= 84.6 min Discarded = 0.07 cfs @ 11.00 hrs, Volume= 4,115 cf Primary = 0.01 cfs @ 13.47 hrs, Volume= 71 cf Routed to nonexistent node 6L Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 97.26' @ 13.47 hrs Surf.Area= 5,690 sf Storage= 1,489 cf Plug-Flow detention time= 181.2 min calculated for 4,183 cf (100% of inflow) Center-of-Mass det. time= 181.2 min ( 938.5 - 757.3 ) Volume Invert Avail.Storage Storage Description #1 97.00' 14,225 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 97.00 5,690 0 0 98.00 5,690 5,690 5,690 99.00 5,690 5,690 11,380 99.50 5,690 2,845 14,225 Device Routing Invert Outlet Devices #1 Primary 97.20' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Discarded 97.00' 0.500 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.07 cfs @ 11.00 hrs HW=97.03' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.07 cfs) Primary OutFlow Max=0.01 cfs @ 13.47 hrs HW=97.26' (Free Discharge)

e area Discarded OutFlow Max=0.07 cfs @ 11.00 hrs HW=97.03' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.07 cfs) Primary OutFlow Max=0.01 cfs @ 13.47 hrs HW=97.26' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.01 cfs @ 0.85 fps)

Proposed Flows NOAA10 24-hr D 2-Year-Current Rainfall=3.43" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Pond 5P: Porous Pavement B Hydrograph 1.41 cfs Inflow Outflow Inflow Area=16,284 sf Discarded Primary Peak Elev=97.26' Storage=1,489 cf 1 Flow (cfs) 0.07 cfs 0.07 cfs 0.01 cfs 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

Proposed Flows NOAA10 24-hr D 2-Year-Current Rainfall=3.43" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Pond 5P: Porous Pavement B Stage-Discharge Total Discarded Primary 99 Elevation (feet) 98 Orifice/Grate Exfiltration 97 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 Discharge (cfs)

Proposed Flows NOAA10 24-hr D 2-Year-Current Rainfall=3.43" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Pond 5P: Porous Pavement B Stage-Area-Storage Surface/Horizontal/Wetted Area (sq-ft) 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 Surface Storage 99 Elevation (feet) 98 Custom Stage Data 97 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 Storage (cubic-feet)

Proposed Flows NOAA10 24-hr D 2-Year-Current Rainfall=3.43" Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 5/26/2026 HydroCAD® 10.20-8a Sampler s/n S05110 © 2025 HydroCAD Software Solutions LLC This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and educational use ONLY. For actual design or modeling applications you MUST use a full version of HydroCAD which may be purchased at www.hydrocad.net. Full programs also include complete technical support,training materials, and additional features which are essential for actual design work. Hydrograph for Pond 5P: Porous Pavement B Time Inflow Storage Elevation Outflow Discarded Primary (hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 97.00 0.00 0.00 0.00 2.50 0.01 15 97.00 0.01 0.01 0.00 5.00 0.02 43 97.01 0.02 0.02 0.00 7.50 0.03 64 97.01 0.03 0.03 0.00 10.00 0.05 102 97.02 0.05 0.05 0.00 12.50 0.14 1,399 97.25 0.07 0.07 0.00 15.00 0.05 1,400 97.25 0.07 0.07 0.00 17.50 0.03 1,124 97.20 0.07 0.07 0.00 20.00 0.03 799 97.14 0.07 0.07 0.00 22.50 0.02 412 97.07 0.07 0.07 0.00 25.00 0.00 28 97.00 0.01 0.01 0.00 27.50 0.00 0 97.00 0.00 0.00 0.00 30.00 0.00 0 97.00 0.00 0.00 0.00 32.50 0.00 0 97.00 0.00 0.00 0.00 35.00 0.00 0 97.00 0.00 0.00 0.00 37.50 0.00 0 97.00 0.00 0.00 0.00 40.00 0.00 0 97.00 0.00 0.00 0.00 42.50 0.00 0 97.00 0.00 0.00 0.00 45.00 0.00 0 97.00 0.00