Hydrogeomorphic Approach for Assessing Wetland Functions (HGM Approach)

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The Hydrogeomorphic Approach (HGM Approach) is a method to assess the functional condition of a specific wetland referenced to data collected from wetlands across a range of physical conditions. The approach utilizes a wetland classification system based on geomorphic position and hydrologic characteristics to group wetlands into seven different wetland classes. Regional Guidebooks are developed to assess specific subclasses of the seven HGM classes of wetlands. HGM at the Subclass Level can be used to assess an array of relevant matter, such as current wetland conditions, mitigation ratios, post-project impacts, and restoration success.