JMA02P003 262 270 Main Street Development Stormwater Management Report

Existing Flows NOAA10 24-hr D 100-Year-Future Rainfall=11.52" 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. Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Existing Impervious Runoff Area=29,916 sf 100.00% Impervious Runoff Depth=11.28" Flow Length=166' Tc=0.9 min CN=98 Runoff=9.05 cfs 28,118 cf Subcatchment 2S: Existing Pervious Runoff Area=302 sf 0.00% Impervious Runoff Depth=8.17" Tc=1.0 min CN=74 Runoff=0.08 cfs 205 cf Link 3L: Total Site Flows Inflow=9.13 cfs 28,323 cf Primary=9.13 cfs 28,323 cf Total Runoff Area = 30,218 sf Runoff Volume = 28,323 cf Average Runoff Depth = 11.25" 1.00% Pervious = 302 sf 99.00% Impervious = 29,916 sf