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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 14 Summary for Pond 1P: INFIL. BED [82] Warning: Early inflow requires earlier time span Inflow Area = 2,482 sf, 98.33% Impervious, Inflow Depth > 2.60" for 25-yr event Inflow = 0.22 cfs @ 11.96 hrs, Volume= 538 cf Outflow = 0.00 cfs @ 10.05 hrs, Volume= 221 cf, Atten= 98%, Lag= 0.0 min Discarded = 0.00 cfs @ 10.05 hrs, Volume= 221 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= 646.82' @ 15.78 hrs Surf.Area= 697 sf Storage= 340 cf Plug-Flow detention time= 176.2 min calculated for 220 cf (41% of inflow) Center-of-Mass det. time= 73.0 min ( 814.8 - 741.8 ) Volume Invert Avail.Storage Storage Description #1 645.60' 836 cf PEA GRAVEL (Prismatic)Listed below (Recalc) 2,091 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 645.60 697 0 0 648.60 697 2,091 2,091 Device Routing Invert Outlet Devices #1 Discarded 645.60' 0.300 in/hr Exfiltration over Surface area #2 Primary 648.30' 3.8' long Broad-Crested Rectangular Weir Head (feet) 0.01 Coef. (English) 2.60 Discarded OutFlow Max=0.00 cfs @ 10.05 hrs HW=645.63' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 5.00 hrs HW=645.60' (Free Discharge) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Page 75 of 84