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 40
Summary for Pond 149P: 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 = 0.10 cfs @ 17.18 hrs, Volume= 11,545 cf, Atten= 96%, Lag= 303.1 min Discarded = 0.10 cfs @ 17.18 hrs, Volume= 11,545 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Routed to Link 147L : POA Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 92.89' @ 17.18 hrs Surf.Area= 3,987 sf Storage= 6,236 cf Plug-Flow detention time= 647.4 min calculated for 11,545 cf (100% of inflow) Center-of-Mass det. time= 647.4 min (1,432.8 - 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 over Surface area
Discarded OutFlow Max=0.10 cfs @ 17.18 hrs HW=92.89' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.10 cfs)
Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=91.00' (Free Discharge) 1=Culvert to Subsurface Basin (Controls 0.00 cfs) 2=Sharp-Crested Rectangular Weir (Controls 0.00 cfs)