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 117
Summary for Subcatchment 17S: Typ. Roof
Runoff = 0.24 cfs @ 12.09 hrs, Volume= Routed to Pond 5P : BIORETENTION BASIN 1A 793 cf, Depth= 5.14"
793 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
1,850 98 Roofs, HSG A
1,850 98 100.00% Impervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec)
2.00 Direct Entry, Pipe Flow
Subcatchment 17S: Typ. Roof