Analysis - Failure NOAA 24-hr D 10 YR-C Rainfall=5.38" Prepared by Civil Core Consulting Printed 12/19/2025 HydroCAD® 10.20-8a s/n 13637 © 2025 HydroCAD Software Solutions LLC Page 113
Summary for Subcatchment 14S: LOT 11 Roof
Runoff = 0.39 cfs @ 12.09 hrs, Volume= Routed to Pond 2P : Subusrface Infiltration Basin 1 1,286 cf, Depth= 5.14"
1,286 cf, Depth= 5.14"
Runoff by SCS TR-20 method, UH=Delmarva, Split Pervious/Imperv. UI as Pervious, Time Span= 0.00-72.00 hrs, dt= NOAA 24-hr D 10 YR-C Rainfall=5.38"
Area (sf) CN Description
3,000 98 Roofs, HSG A
3,000 98 100.00% Impervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec)
Direct Entry, Pipe Flow
0.3 40 2.00
Subcatchment 14S: LOT 11 Roof