Recommended hydroperiod standards for wetlands Recommended hydroperiod standards for wetlands

Recommended hydroperiod standards for wetlands (Source: State of Minnesota Storm-Water Advisory group, 1997
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Hydroperiod standard	Susceptible		Non-susceptible
	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