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Rustys_Post-Construction - Copy Type II 24-hr 25-yr Rainfall=3.84" Prepared by Waves AE Printed 7/29/2026 HydroCAD® 10.20-7a s/n 13900 © 2025 HydroCAD Software Solutions LLC Page 20 Summary for Pond 6P: INFIL. BED 5 Inflow Area = 18,751 sf, 34.05% Impervious, Inflow Depth > 1.89" for 25-yr event Inflow = 1.44 cfs @ 11.96 hrs, Volume= 2,953 cf Outflow = 0.01 cfs @ 10.65 hrs, Volume= 431 cf, Atten= 99%, Lag= 0.0 min Discarded = 0.01 cfs @ 10.65 hrs, Volume= 431 cf Primary = 0.00 cfs @ 5.00 hrs, Volume= 0 cf Routed to Link AP2 : BASIN Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 645.64' @ 20.00 hrs Surf.Area= 1,686 sf Storage= 2,521 cf Plug-Flow detention time= 220.3 min calculated for 431 cf (15% of inflow) Center-of-Mass det. time= 109.9 min ( 893.5 - 783.6 ) Volume Invert Avail.Storage Storage Description #1 641.90' 3,844 cf PEA GRAVEL (Prismatic)Listed below (Recalc) 9,610 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 641.90 1,686 0 0 647.60 1,686 9,610 9,610 Device Routing Invert Outlet Devices #1 Discarded 641.90' 0.300 in/hr Exfiltration over Surface area #2 Primary 645.90' 6.0' long Broad-Crested Rectangular Weir Head (feet) 0.01 Coef. (English) 2.60 Discarded OutFlow Max=0.01 cfs @ 10.65 hrs HW=641.96' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 5.00 hrs HW=641.90' (Free Discharge) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Page 81 of 84