JMA02P003 262 270 Main Street Development Stormwater Management Report

Proposed Flows NOAA10 24-hr D 10-Year-Current Rainfall=5.33" 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 Subcatchment 3S: Proposed Pervious Runoff = 0.08 cfs @ 12.07 hrs, Volume= 199 cf, Depth= 2.63" Routed to Pond 5P : Porous Pavement B Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA10 24-hr D 10-Year-Current Rainfall=5.33" Area (sf) CN Description 907 74 >75% Grass cover, Good, HSG C 907 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 3S: Proposed Pervious Hydrograph 0.085 Runoff 0.08 cfs 0.08 0.075 NOAA10 24-hr D 0.07 10-Year-Current Rainfall=5.33" 0.065 Runoff Area=907 sf 0.06 Runoff Volume=199 cf 0.055 Runoff Depth=2.63"

Runoff Volume=199 cf 0.055 Runoff Depth=2.63" 0.05 Flow (cfs) 0.045 Tc=1.0 min 0.04 CN=74 0.035 0.03 0.025 0.02 0.015 0.01 0.005 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)