Runoff = 0.44 cfs @ 12.19 hrs, Volume= 0.056 af, Depth= 6.10"
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 10-Year-Projected Rainfall=6.34"
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)
0.8 207 0.0100 4.50 1.57 Pipe Channel, A-B 8.0" Round Area= 0.3 sf Perim= 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)
| 2026-02 Existing and Proposed | NOAA 24-hr D 10-Year-Projected Rainfall=6.34" |
|---|---|
| Prepared by Dynamic Engineering | Printed 2/10/2026 |
| HydroCAD\circledR 10.20-8a s/n 08640\circledC 2025 HydroCAD Software Solutions LLC | Page 82 |
Runoff = 0.01 cfs @ 12.53 hrs, Volume= 0.004 af, Depth= 0.55" 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 10-Year-Projected Rainfall=6.34"
| Area (ac) | CN | Description |
|---|---|---|
| 0.090 | 39 | >75% Grass cover, Good, HSG A |
| 0.090 | 39 | 100.00% Pervious Area |
| Tc (min) | Length (feet) | Slope (ft/ft) Velocity (ft/sec) Capacity (cfs) |
| 4.8 | 58 | 0.0300 0.20 |
| Sheet Flow, A-B | ||
| Grass: Short n= 0.150 P2= 4.04" | ||
4.8 58 Total, Increased to minimum Tc = 10.0 min
Subcatchment 19S: Study Area Road Undetained (Perv)