TABLE A–1 Survey of Studies: Comparison of Mitigation and Natural Wetlands

Region

Time Period

# Sites

Scope

Massachusetts

1983 to 1994

114

Vegetation (% cover) Size Hydrology If project was built

Portland, Oregon

1987 to 1993

95

Freshwater emergent and open-water wetlands, soil organic matter (SOM), hydrology

Orange County, California

1979 to 1993

70

Vegetation, hydrology



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