The Hydrogeomorphic (HGM) Approach is a collection of concepts and methods for developing functional indices and subsequently using them to assess the capacity of a wetland to perform functions relative to similar wetlands in a region. The Approach was initially designed to be used in the context of the Clean Water Act Section 404 Regulatory Program permit review sequence to consider alternatives, minimize impacts, assess unavoidable project impacts, determine mitigation

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An investigation of baldc3n?ress stands associated with Cadclo Lake was undertaken as part of an evaluation of a proposed project to increase storage capacity of the lake. Existing stands either were impacted by or established in response to an increase in water levels that occurred sevent,¢ years ago. Examination of stand characlcristics and hydrologic records indicated a predictable response to water fluctuation pallems that provided a basis for assessment of various proposed project ahematives. Baldcypress is able to persist in the face of hydrologic regime changes, but growth, reproduction, and survival are directly related to the frequency of substrate exposure. Relationships defined in this study may be useful in identifying impact thresholds and optimal water management strategies for other baldcypmss stands.

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