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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 16 Summary for Pond 4P: INFIL. BED SAND [82] Warning: Early inflow requires earlier time span [92] Warning: Device #1 is above defined storage [93] Warning: Storage range exceeded by 0.02' [88] Warning: Qout>Qin may require smaller dt or Finer Routing [85] Warning: Oscillations may require smaller dt or Finer Routing (severity=77) Inflow Area = 3,392 sf, 99.91% Impervious, Inflow Depth > 3.32" for 25-yr event Inflow = 0.48 cfs @ 11.89 hrs, Volume= 940 cf Outflow = 0.52 cfs @ 11.89 hrs, Volume= 647 cf, Atten= 0%, Lag= 0.3 min Discarded = 0.00 cfs @ 5.35 hrs, Volume= 121 cf Primary = 0.52 cfs @ 11.89 hrs, Volume= 526 cf Routed to Link AP2 : BASIN Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 648.14' @ 11.89 hrs Surf.Area= 244 sf Storage= 293 cf Plug-Flow detention time= 109.7 min calculated for 645 cf (69% of inflow) Center-of-Mass det. time= 42.9 min ( 770.3 - 727.4 ) Volume Invert Avail.Storage Storage Description #1 644.12' 293 cf Sand/Fill (Prismatic)Listed below (Recalc) 976 cf Overall x 30.0% Voids Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 644.12 244 0 0 646.62 244 610 610 648.12 244 366 976 Device Routing Invert Outlet Devices #1 Primary 648.12' 59.7' long Broad-Crested Rectangular Weir Head (feet) 0.01 Coef. (English) 2.60 #2 Discarded 644.12' 0.400 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.00 cfs @ 5.35 hrs HW=644.16' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max=0.31 cfs @ 11.89 hrs HW=648.14' (Free Discharge) 1=Broad-Crested Rectangular Weir (Weir Controls 0.31 cfs @ 0.33 fps) Page 77 of 84