102 Sams -REV 12-02-25 NOAA 24-hr D 10-Year Rainfall=5.38" Prepared by Haler Consulting Printed 04/12/2025 HydroCAD® 10.20-2h s/n 10351 © 2024 HydroCAD Software Solutions LLC Page 30
Summary for Pond 184P: WQ Infiltration Basin #2
Inflow Area =86,443 sf,27.15% Impervious,Inflow Depth =1.60" for 10-Year event
Inflow =2.42 cfs @12.13 hrs,Volume=11,545 cf
Outflow =0.47 cfs @12.71 hrs,Volume=7,983 cf, Atten= 81%, Lag= 34.7 min
Discarded =0.00 cfs @0.00 hrs,Volume=0 cf
Primary =0.47 cfs @12.71 hrs,Volume=7,983 cf
Routed to Link 185L : POA
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 93.00' Surf.Area= 4,067 sf Storage= 6,668 cf Peak Elev= 94.29' @ 12.71 hrs Surf.Area= 5,259 sf Storage= 12,701 cf (6,033 cf above start)
Plug-Flow detention time = 1,244.2 min calculated for 1,315 cf (11% of inflow) Center-of-Mass det. time = 244.7 min (1,030.2 - 785.4)
VolumeInvertAvail.StorageStorage Description
#191.00'13,818 cfCustom Stage Data (Prismatic) Listed below (Recalc)
Elevation (feet)Surf.Area (sq-ft)Inc.Store (cubic-feet)Cum.Store (cubic-feet)
91.002,62800
92.003,3202,9742,974
93.004,0673,6946,668
94.005,0104,53911,206
94.505,4382,61213,818
DeviceRoutingInvertOutlet Devices
#1Primary93.80'6.0" Round Culvert to Subsurface Basin L= 35.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 92.00' / 93.80' S= -0.0514'' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.20 sf
#2Device 193.00'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
#3Discarded91.00'1.050 in/hr Exfiltration X 0.00 over Surface area
Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=93.00' (Free Discharge) 3=Exfiltration (Controls 0.00 cfs)
Primary OutFlow Max=0.47 cfs @ 12.71 hrs HW=94.29' (Free Discharge) 1=Culvert to Subsurface Basin (Inlet Controls 0.47 cfs @ 2.39 fps) 2=Sharp-Crested Rectangular Weir (Passes 0.47 cfs of 13.88 cfs potential flow)