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: The Hydrogeomorphic (HGM) Approach is a method for developing functional indices and the protocols used to apply these indices to the assessment of wetland functions at a site-specific scale. The HGM Approach was initially designed to be used in the context of the Clean Water Act Section 404 Regulatory Program permit review to analyze project alternatives, minimize impacts, assess unavoidable impacts, determine mitigation requirements, and monitor the success of compensatory mitigation. However, a variety of other potential uses have been identified, including the determination of minimal effects under the Food Security Act, design of wetland restoration projects, and management of wetlands. This report uses the HGM Approach to develop a Regional Guidebook for assessing the functions of five regional wetlands subclasses that occcur the Yazoo Basin of the Lower Mississippi River Alluvial Valley. The five regional subclasses include Flats, Riverine Overbank, Riverine Backwater, Isolated Depression, and Connected Depression. The report begins with an overview of the HGM Approach and then classifies and characterizes these wetland subclasses in the context of the Yazoo Basin reference domain. It then discusses for each wetland subclass (a) the rationale used to select functions, (b)the rationale used to select model variables, (c) the rationale used to develop assessment models, and (d) the data from reference wetlands used to calibrate model variables and assessment models. Finally, it outlines an assessment protocol for using the model variables and functional indices to assess each of the wetland subclasses.

us army corps of engineers: engineer research and development center (knowledge core)

A Regional Guidebook for Applying the Hydrogeomorphic Approach to Assessing Wetland Functions of Selected Regional Wetland Subclasses, Yazoo Basin, Lower Mississippi River Alluvial Valley