Runoff = 0.13 cfs @ 12.22 hrs, Volume= 0.018 af, Depth= 1.83" Routed to Link 8L : Existing Study Area Road (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
0.120 39 >75% Grass cover, Good, HSG A
0.120 39 100.00% Pervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs)
1.0 61 0.0100 1.06 Sheet Flow, A-B Smooth surfaces n = 0.011 P2= 4.04"
1.0 61 Total, Increased to minimum Tc = 10.0 min
Subcatchment 7S: Ex. Study Area Road (Perv)
| 2026-02 Existing and Proposed | NOAA 24-hr D 100-Year-Current Rainfall=9.48" |
|---|---|
| Prepared by Dynamic Engineering | Printed 2/10/2026 |
| HydroCAD\circledR 10.20-8a s/n 08640\circledC 2025 HydroCAD Software Solutions LLC | Page 98 |
Runoff = 3.63 cfs @ 12.19 hrs, Volume= 0.470 af, Depth= 9.24" Routed to Link 10L : Study Area Study Area WQ MTD A-110 (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
0.610 98 Paved parking, HSG A
0.610 98 100.00% Impervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs) Description
0.6 55 0.0302 1.62 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 4.04"
1.3 297 0.0035 3.68 4.52 Pipe Channel, B-C 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.011 Concrete pipe, straight & clean
1.9 352 Total Increased to minimum Tc = 10.0 min
1.9 352 Total, Increased to minimum Tc = 10.0 min
Subcatchment 10S: Study Area WQ MTD A-110 (Imp)