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25-4181 storm calcs - proposed Type II 24-hr 25-Year Rainfall=3.84" Prepared by Carmina Wood Design Printed 2/11/2026 HydroCAD® 10.20-8a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 22 Summary for Pond 3P: Underground Detention [44] Hint: Outlet device #1 is below defined storage Inflow Area = 53,039 sf, 53.36% Impervious, Inflow Depth = 2.77" for 25-Year event Inflow = 5.41 cfs @ 11.98 hrs, Volume= 12,233 cf Outflow = 2.05 cfs @ 12.11 hrs, Volume= 12,233 cf, Atten= 62%, Lag= 7.8 min Primary = 2.05 cfs @ 12.11 hrs, Volume= 12,233 cf Routing by Stor-Ind method, Time Span= 0.50-70.02 hrs, dt= 0.04 hrs Peak Elev= 527.83' @ 12.11 hrs Surf.Area= 2,480 sf Storage= 3,418 cf Plug-Flow detention time= 28.6 min calculated for 12,233 cf (100% of inflow) Center-of-Mass det. time= 28.0 min ( 826.2 - 798.2 ) Volume Invert Avail.Storage Storage Description #1A 525.80' 2,278 cf 63.25'W x 39.22'L x 3.50'H Field A 8,682 cf Overall - 2,986 cf Embedded = 5,695 cf x 40.0% Voids #2A 526.30' 2,986 cf ADS_StormTech SC-740 +Cap x 65 Inside #1 Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 65 Chambers in 13 Rows 5,264 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 525.79' 8.0" Round Culvert L= 24.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 525.79' / 525.67' S= 0.0050 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.35 sf Primary OutFlow Max=2.04 cfs @ 12.11 hrs HW=527.82' (Free Discharge) 1=Culvert (Barrel Controls 2.04 cfs @ 5.86 fps) Page 52 of 65