Recommended hydroperiod standards for wetlands
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 |