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<th>20</th> | <th>20</th> | ||
<th>ac.</th> | <th>ac.</th> | ||
− | <th>new impervious area in acres (40%</th> | + | <th>new impervious area in acres (40%)</th> |
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− | <th colspan="4">Watershed peak discharge and runoff volume<th> | + | <th colspan="4">Watershed peak discharge and runoff volume:</th> |
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Watershed runoff characteristics
Link to this table
Given: | |||
---|---|---|---|
Area = | 50 | ac. | total watershed area in acres draining to pond |
IC = | 20 | ac. | new impervious area in acres (40%) |
Watershed peak discharge and runoff volume: | |||
Event | Pre-development | Post-development | Unit |
Q1-yr 24-hr | 6.7 | 53.5 | cfs |
Q2-yr 24-hr | 11.6 | 69.0 | cfs |
Q10-yr 24-hr | 36.7 | 131.9 | cfs |
Q100-yr 24-hr | 81.8 | 222.0 | cfs |
V1-yr 24-hr | 0.3 | 3.9 | ac-ft |
V2-yr 24-hr | 0.6 | 4.9 | ac-ft |
V10-yr 24-hr | 3.1 | 8.9 | ac-ft |
V100-yr 24-hr | 7.5 | 14.7 | ac-ft |
This page was last edited on 7 August 2022, at 12:19.