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 4S: Proposed Impervious Runoff = 2.15 cfs @ 12.06 hrs, Volume= 6,526 cf, Depth= 5.09" 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 15,377 98 Paved parking, HSG C 15,377 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 4S: Proposed Impervious Hydrograph Runoff 2.15 cfs NOAA10 24-hr D 2 10-Year-Current Rainfall=5.33" Runoff Area=15,377 sf Runoff Volume=6,526 cf Runoff Depth=5.09" Flow (cfs)

f Runoff Depth=5.09" Flow (cfs) Tc=1.0 min CN=98 1 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)