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25-4181 storm calcs - proposed Type II 24-hr 10-Year Rainfall=3.14" Prepared by Carmina Wood Design Printed 2/11/2026 HydroCAD® 10.20-8a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 13 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 2S: Proposed Site Runoff Area=53,039 sf 53.36% Impervious Runoff Depth=2.11" Flow Length=368' Tc=7.4 min CN=90 Runoff=4.19 cfs 9,340 cf Pond 3P: Underground Detention Peak Elev=527.35' Storage=2,548 cf Inflow=4.19 cfs 9,340 cf 8.0" Round Culvert n=0.013 L=24.0' S=0.0050 '/' Outflow=1.69 cfs 9,340 cf Total Runoff Area = 53,039 sf Runoff Volume = 9,340 cf Average Runoff Depth = 2.11" 46.64% Pervious = 24,735 sf 53.36% Impervious = 28,304 sf Page 43 of 65