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.
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
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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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