2026-02 Existing and Proposed NOAA 24-hr D 100-Year-Current Rainfall=9.48" Prepared by Dynamic Engineering Printed 2/10/2026 HydroCAD® 10.20-8a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 101
Summary for Subcatchment 14S: Study Area West Undetained
Runoff = 0.33 cfs @ 12.22 hrs, Volume= 0.047 af, Depth= 1.83" 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 100-Year-Current Rainfall=9.48"
Area (ac) CN Description
0.310 39 >75% Grass cover, Good, HSG A
0.310 39 100.00% Pervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs) Description
2.7 48 0.0850 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
2026-02 Existing and ProposedNOAA 24-hr D100-Year-CurrentRainfall=9.48"
Prepared by Dynamic EngineeringPrinted2/10/2026
HydroCAD\circledR 10.20-8a s/n 08640© 2025 HydroCAD Software Solutions LLCPage 102
Summary for Subcatchment 15S: Study Area Roof (Imp)
Runoff = 0.65 cfs @ 12.19 hrs, Volume= 0.085 af, Depth= 9.24" Routed to Link 16L : Study Area Basin A (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 100-Year-Current Rainfall=9.48"
Area (ac) CN Description
0.110 98 Roofs, HSG A
0.110 98 100.00% Impervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs) Description
0.8 207 0.0100 4.50 1.57 Pipe Channel, A-B 8.0" Round Area= 0.3 sf Perm= 2.1' r= 0.17' n= 0.010 PVC, smooth interior
0.8 207 Total, Increased to minimum Tc = 10.0 min
Subcatchment 15S: Study Area Roof (Imp)