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23-4121 storm calcs - Existing Type II 24-hr 1-Year Rainfall=1.87" Prepared by Carmina Wood Design Printed 5/14/2026 HydroCAD® 10.20-8a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 6 Time span=0.50-70.00 hrs, dt=0.04 hrs, 1739 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 - North Runoff Area=181,234 sf 0.00% Impervious Runoff Depth=0.48" Flow Length=806' Tc=28.2 min CN=80 Runoff=1.59 cfs 7,325 cf Subcatchment 2S: Existing - South Runoff Area=93,939 sf 0.00% Impervious Runoff Depth=0.48" Flow Length=362' Slope=0.0370 '/' Tc=20.1 min CN=80 Runoff=1.04 cfs 3,797 cf Total Runoff Area = 275,173 sf Runoff Volume = 11,121 cf Average Runoff Depth = 0.48" 100.00% Pervious = 275,173 sf 0.00% Impervious = 0 sf Page 511 of 849