Difference between revisions of "Recommended hydroperiod standards for wetlands"
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<tr> | <tr> | ||
<th rowspan="2">Hydroperiod standard</th> | <th rowspan="2">Hydroperiod standard</th> | ||
| − | <th colspan="2">Susceptible</th> | + | <th colspan="2"><center>Susceptible</center></th> |
| − | <th colspan="2">Non-susceptible</th> | + | <th colspan="2"><center>Non-susceptible</center></th> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| Line 26: | Line 26: | ||
<td>Existing or less</td> | <td>Existing or less</td> | ||
<td>Existing or less</td> | <td>Existing or less</td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td>Inundation period for 1 and 2 year precipitation event</td> | ||
| + | <td>Existing</td> | ||
| + | <td>Existing plus 1 day</td> | ||
| + | <td>Existing plus 2 days</td> | ||
| + | <td>Existing plus 7 days</td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td>Inundation period for 10 year precipitation event and greater</td> | ||
| + | <td>Existing</td> | ||
| + | <td>Existing plus 7 days</td> | ||
| + | <td>Existing plus 14 days</td> | ||
| + | <td>Existing plus 21 days</td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td>Run-out control elevation (free flowing)</td> | ||
| + | <td>No change</td> | ||
| + | <td>No change</td> | ||
| + | <td>0 to 1.0 feet above existing run out</td> | ||
| + | <td>0 to 4.0 feet above existing run-out</td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td>Run-out control elevation</td> | ||
| + | <td>Above delineated wetland</td> | ||
| + | <td>Above delineated wetland</td> | ||
| + | <td>Above delineated wetland</td> | ||
| + | <td>Above delineated wetland</td> | ||
</tr> | </tr> | ||
</table> | </table> | ||
[[category:Table]] | [[category:Table]] | ||
Revision as of 20:59, 28 March 2013
Recommended hydroperiod standards for wetlands (Source: State of Minnesota Storm-Water Advisory group, 1997
Link to this table
| Hydroperiod standard | ||||
|---|---|---|---|---|
| Highly susceptible wetlands | Moderately susceptible wetlands | Slightly susceptible wetlands | Least susceptible wetlands | |
| Storm bounce | existing | Existing plus 0.5 feet | Existing plus 1.0 feet | No limit |
| Discharge rate from wetland | Existing | Existing | Existing or less | Existing or less |
| Inundation period for 1 and 2 year precipitation event | Existing | Existing plus 1 day | Existing plus 2 days | Existing plus 7 days |
| Inundation period for 10 year precipitation event and greater | Existing | Existing plus 7 days | Existing plus 14 days | Existing plus 21 days |
| Run-out control elevation (free flowing) | No change | No change | 0 to 1.0 feet above existing run out | 0 to 4.0 feet above existing run-out |
| Run-out control elevation | Above delineated wetland | Above delineated wetland | Above delineated wetland | Above delineated wetland |