2026-02 Existing and Proposed NOAA 24-hr D 2-Year-Projected Rainfall=4.04" Prepared by Dynamic Engineering Printed 2/10/2026 HydroCAD® 10.20-8a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 37
Summary for Subcatchment 12S: Study Area Road Undetained (Imp)
Runoff = 0.08 cfs @ 12.19 hrs, Volume= 0.010 af, Depth= 3.81" Routed to Link 18L : Study Area Road Undetained (Total)
Runoff by SCS TR-20 method, UH=Delmarva, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year-Projected Rainfall=4.04"
Area (ac) CN Description
0.030 98 Paved parking, HSG A
0.030 98 100.00% Impervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs) Description
0.4 35 0.0322 1.52 Sheet Flow, A-B Smooth surfaces n = 0.011 P2= 4.04"
0.4 35 Total, Increased to minimum Tc = 10.0 min
Subcatchment 12S: Study Area Road Undetained (Imp)
2026-02 Existing and ProposedNOAA 24-hr D 2-Year-Projected Rainfall=4.04"
Prepared by Dynamic EngineeringPrinted 2/10/2026
HydroCAD\circledR 10.20-8a s/n 08640\circledR 2025 HydroCAD Software Solutions LLCPage 38
Summary for Subcatchment 14S: Study Area West Undetained
Runoff = 0.00 cfs @ 17.02 hrs, Volume= 0.001 af, Depth= 0.05"
Routed to Link 14L : Study Area West (Total)
Runoff by SCS TR-20 method, UH=Delmarva, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
NOAA 24-hr D 2-Year-Projected Rainfall=4.04"
Area (ac)CNDescription
0.31039>75% Grass cover, Good, HSG A
0.31039100.00% Pervious Area
Tc (min)Length (feet)Slope (ft/ft) Velocity (ft/sec) Capacity (cfs)
2.7480.0850 0.29 Sheet Flow, A-B Grass: Short n= 0.150 P2= 4.04"
2.7 48 Total, Increased to minimum Tc = 10.0 min
Subcatchment 14S: Study Area West Undetained