Difference between revisions of "Watershed runoff characteristics"
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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> |
</tr> | </tr> | ||
<tr> | <tr> | ||
Revision as of 01:22, 29 March 2013
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 | |