Criteria for a functionally significant wetland:
Reference:
Cedfeldt, Paul T., Mary C. Watzin, and Bruce Dingee Richardson. "Using GIS to identify functionally significant wetlands in the Northeastern United States." Environmental management 26, no. 1 (2000): 13-24.
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Flood Flow Alteration | |
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Upslope wetlands < 5% of the wetland’s watershed | |
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Wetland area <20% of watershed area | |
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Majority of the watershed is made of impervious surfaces | |
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Most soils (>80%) have a slow infiltration rate <.06” /hour | |
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Wetland is located near intermittent or first order stream | |
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Wetland > 81 hectares | |
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Surface Water Improvement | |
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Watershed => potential pollutants | |
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Majority of watershed != forest or scrub | |
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Wetland < 5% watershed acreage | |
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Upslope wetlands < 5% of the watershed | |
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Avg. slope > 10% in watershed | |
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Wetland type => riparian | |
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Soil Type histosol or frequently flooded mineralized soil with high clay and organic materials levels | |
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Near a 1st order or intermittent stream | |
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Wildlife Habitat | |
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1+ wetland of a different type bordering the wetland | |
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Least common among other watershed types | |
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Connection to surface water network | |
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A football field or more of natural vegetation along the perimeter of the defined wetland | |
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Hydrologically connected to another wetland within 400 meters | 
Reference:
Cedfeldt, Paul T., Mary C. Watzin, and Bruce Dingee Richardson. "Using GIS to identify functionally significant wetlands in the Northeastern United States." Environmental management 26, no. 1 (2000): 13-24.
 
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