102 Sams -REV 12-02-25 NOAA 24-hr D 2-Year Rainfall=3.42" Prepared by Haler Consulting Printed 04/12/2025 HydroCAD® 10.20-2h s/n 10351 © 2024 HydroCAD Software Solutions LLC Page 10
Summary for Pond 183P: WQ Infiltration Basin #1
Inflow Area =108,596 sf,29.12% Impervious,Inflow Depth = 0.93" for 2-Year event
Inflow =2.34 cfs @12.11 hrs,Volume= 8,433 cf
Outflow =0.26 cfs @12.92 hrs,Volume= 4,631 cf,
Discarded =0.00 cfs @0.00 hrs,Volume= 0 cf
Primary =0.26 cfs @12.92 hrs,Volume= 4,631 cf
Routed to Link 185L : POA
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 97.00' Surf.Area= 6,008 sf Storage= 10,212 cf Peak Elev= 97.83' @ 12.92 hrs Surf.Area= 6,819 sf Storage= 15,558 cf (5,346 cf above start)
Plug-Flow detention time = (not calculated: initial storage exceeds outflow) Center-of-Mass det. time = 311.5 min (1,069.7 - 758.2)
VolumeInvertAvail.StorageStorage Description
#195.00'16,706 cfCustom Stage Data (Prismatic) Listed below (Recalc)
Elevation (feet)Surf.Area (sq-ft)Inc.Store (cubic-feet)Cum.Store (cubic-feet)
95.004,23100
96.005,0924,6624,662
97.006,0085,55010,212
98.006,9816,49516,706
DeviceRoutingInvertOutlet Devices
#1Primary97.60'15.0" Round Culvert to Subsurface Basin L= 35.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 95.00' / 97.60' S= -0.0743'' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 1.23 sf
#2Device 197.00'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
#3Discarded95.00'3.100 in/hr Exfiltration X 0.00 over Surface area
Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=97.00' (Free Discharge) 3=Exfiltration (Controls 0.00 cfs)
Primary OutFlow Max=0.26 cfs @ 12.92 hrs HW=97.83' (Free Discharge) 1=Culvert to Subsurface Basin (Inlet Controls 0.26 cfs @ 1.65 fps) 2=Sharp-Crested Rectangular Weir (Passes 0.26 cfs of 6.63 cfs potential flow)