• Reliably indicate important wetland processes, or at least scientifically established structural surrogates of those processes.

  • Scale assessment results to results from reference sites.

  • Are sensitive to changes in performance over a dynamic range.

  • Are integrative over space and time.

  • Generate parametric and dimensioned units, rather than nonparametric rank.

2. Impact sites should be evaluated using the same functional assessment tools used for the mitigation site.

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