Analysis - County NOAA 24-hr D 2 YR-C Rainfall=3.42" Prepared by Civil Core Consulting Printed 10/24/2025 HydroCAD® 10.20-7a s/n 13637 © 2025 HydroCAD Software Solutions LLC Page 10
Summary for Pond CB-1: County Basin-1
Inflow Area = 8,276 sf, 68.42% Impervious, Inflow Depth = 2.18" for 2 YR-C event Inflow = 0.44 cfs @ 12.11 hrs, Volume= 1,505 cf Outflow = 0.06 cfs @ 11.57 hrs, Volume= 1,505 cf, Atten= 87%, Lag= 0.0 min Discarded = 0.06 cfs @ 11.57 hrs, Volume= 1,505 cf Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 88.91' @ 12.67 hrs Surf.Area= 0.006 ac Storage= 0.009 af Plug-Flow detention time= 37.2 min calculated for 1,505 cf (100% of inflow) Center-of-Mass det. time= 37.2 min (792.4 - 755.3)
VolumeInvertAvail.StorageStorage Description
#1A86.00'0.005 af4.00'W x 61.67'L x 3.00'H Field A
0.017 af Overall - 0.005 af Embedded = 0.012 af x 40.0% Voids
#2A86.33'0.004 afADS N-12 24" x 3 Inside #1
Inside = 23.8"W x 23.8"H => 3.10 sf x 20.00'L = 62.0 cf
Outside = 28.0"W x 28.0"H => 3.92 sf x 20.00'L = 78.4 cf
0.009 af Total Available Storage
Storage Group A created with Chamber Wizard
DeviceRoutingInvertOutlet Devices
#1Discarded86.00'10.000 in/hr Exfiltration over Surface area
Discarded OutFlowMax=0.06 cfs @ 11.57 hrsHW=86.03' (Free Discharge)
1=Exfiltration (Exfiltration Controls 0.06 cfs)
Pond CB-1: County Basin-1 Exfiltration