JMA02P003 262 270 Main Street Development Stormwater Management Report

Existing 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 Subcatchment 1S: Existing Impervious Runoff = 2.67 cfs @ 12.06 hrs, Volume= 7,969 cf, Depth= 3.20" Routed to Link 3L : Total Site Flows 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 2-Year-Current Rainfall=3.43" Area (sf) CN Description 11,049 98 Roofs, HSG C 18,867 98 Paved parking, HSG C 29,916 98 Weighted Average 29,916 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.7 100 0.0750 2.42 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.43" 0.2 66 0.0530 4.67 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.9 166 Total