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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 18 Summary for Pond 5P: INFIL. BED [82] Warning: Early inflow requires earlier time span [92] Warning: Device #2 is above defined storage [93] Warning: Storage range exceeded by 0.01' [85] Warning: Oscillations may require smaller dt or Finer Routing (severity=76) Inflow Area = 630 sf, 99.39% Impervious, Inflow Depth > 3.32" for 25-yr event Inflow = 0.08 cfs @ 11.96 hrs, Volume= 175 cf Outflow = 0.02 cfs @ 12.16 hrs, Volume= 75 cf, Atten= 79%, Lag= 11.8 min Discarded = 0.00 cfs @ 6.00 hrs, Volume= 37 cf Primary = 0.02 cfs @ 12.16 hrs, Volume= 38 cf Routed to Pond 1P : INFIL. BED Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 648.51' @ 12.15 hrs Surf.Area= 100 sf Storage= 100 cf Plug-Flow detention time= 162.9 min calculated for 75 cf (43% of inflow) Center-of-Mass det. time= 61.0 min ( 792.7 - 731.7 ) Volume Invert Avail.Storage Storage Description #1 646.00' 100 cf PEA GRAVEL (Prismatic)Listed below (Recalc) 250 cf Overall x 40.0% Voids Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 646.00 100 0 0 648.50 100 250 250 Device Routing Invert Outlet Devices #1 Discarded 646.00' 0.300 in/hr Exfiltration over Surface area #2 Primary 648.50' 5.0' long Broad-Crested Rectangular Weir Head (feet) 0.01 Coef. (English) 2.60 Discarded OutFlow Max=0.00 cfs @ 6.00 hrs HW=646.03' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.01 cfs @ 12.16 hrs HW=648.51' (Free Discharge) 2=Broad-Crested Rectangular Weir (Weir Controls 0.01 cfs @ 0.21 fps) Page 79 of 84