NOAA 24-hr D 2 YR-C Rainfall=3.42" Printed 10/24/2025
Analysis - Proposed Conditions Prepared by Civil Core Consulting HydroCAD® 10.20-7a s/n 13637 © 2025 HydroCAD Software Solutions LLC
Page 27
Summary for Pond 37P: Subsurface Basin Lot 1
Inflow Area = 1,850 sf,100.00% Impervious, Inflow Depth = 3.19" for 2 YR-C event Inflow = 0.15 cfs @ 12.09 hrs, Volume= 491 cf Outflow = 0.03 cfs @ 11.83 hrs, Volume= 491 cf, Atten=78%, Lag=0.0 min Discarded = 0.03 cfs @ 11.83 hrs, Volume= 491 cf Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 91.36' @ 12.31 hrs Surf.Area= 0.013 ac Storage= 0.002 af Plug-Flow detention time= 11.6 min calculated for 491 cf (100% of inflow) Center-of-Mass det. time= 11.6 min (763.5 - 751.9)
VolumeInvertAvail.StorageStorage Description
#1A91.00'0.008 af10.06'W x 57.33'L x 2.17'H Field A
0.029 af Overall - 0.008 af Embedded = 0.020 af x 40.0% Voids
#2A91.33'0.006 afADS N-12 15" x 12 Inside #1 Inside = 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside = 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment = -7.00' x 1.20 sf x 4 rows 8.72' Header x 1.20 sf x 2 = 20.9 cf Inside
0.014 af Total Available Storage
Storage Group A created with Chamber Wizard
DeviceRoutingInvertOutlet Devices
#1Discarded91.00'2.450 in/hr Exfiltration over Surface area
Discarded OutFlowMax=0.03 cfs @ 11.83 hrs HW=91.02' (Free Discharge)
1=Exfiltration (Exfiltration Controls 0.03 cfs)
Pond 37P: Subsurface Basin Lot 1
Exfiltration