Difference between revisions of "Wet detention pond - Extreme flood (10-yr 24-hr) outlet configuration"
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| − | <th>1-yr 24-hr | + | <th>1-yr 24-hr Instantaneous volume</th> |
<th>1-yr 24-hr routed (R124)</th> | <th>1-yr 24-hr routed (R124)</th> | ||
| − | <th>1/2 Pre-development 2-yr 24-hr peak | + | <th>1/2 Pre-development 2-yr 24-hr peak Instantaneous volume)</th> |
<th>1/2 Pre-development 2-yr 24-hr peak routed (R224)</th> | <th>1/2 Pre-development 2-yr 24-hr peak routed (R224)</th> | ||
</tr> | </tr> | ||
Revision as of 13:21, 1 May 2015
Wet detention pond - Extreme flood (10-yr 24-hr) outlet configuration
Link to this table
| Design methodology | ||||
|---|---|---|---|---|
| 1-yr 24-hr Instantaneous volume | 1-yr 24-hr routed (R124) | 1/2 Pre-development 2-yr 24-hr peak Instantaneous volume) | 1/2 Pre-development 2-yr 24-hr peak routed (R224) | |
| Weir length (ft) | 3.0 | 3.9 | 3.1 | 4.6 |
| Weir elevation (ft) | 114.72 | 110.2 | 114.7 | 110.1 |
| Surface area at weir elevation (ac) | 1.2 | 0.9 | 1.2 | 0.9 |
| Peak discharge per design event (cfs)1 | 81.8 | 81.5 | 81.8 | 81.4 |
| Peak water elevation per design event (ft) | 118.4 | 112.0 | 118.4 | 111.8 |
| Designed surface area at HWL (ac) | 2.01 | 1.0 | 2.0 | 1.0 |
1Note that the kerplunk method requires twice the surface area (4 percent vs 2 percent of drainage area) and about 6 more feet of storage depth than the routed method for this design event. This is the result of introducing the entire event volume at once versus the more realistic routing of inflow and outflow.