This number represents the sheet flow time computed for each column of sheet flow data. Flow time for sheet flow is computed as:
| |
T |
= |
Sheet flow time (hr.) |
| |
n |
= |
Manning’s roughness coefficient from TR-55 table |
| |
L |
= |
Flow length (ft) |
| |
P2 |
= |
Two-year, 24-hour rainfall (in) |
| |
Sf |
= |
Slope (ft/ft) |
