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2.) Minimize the impact by limiting the degree or magnitude of the wetland related activity and its implementation. 3.) Rectify the impact by repairing, rehabilitating, or restoring the affected wetland environment with one of at least equal public value. 4.) Reduce or eliminate the impact over time by preservation and maintenance operations during the life of the activity. 5.) Compensating for the impact by replacing or providing substitute wetland resources or environments with those of at least equal public value. Compensation, including the replacement ratio and quality of replacement should be consistent with the requirements outlined in the rules adopted by the Board of Water and Soil Resources to implement the Wetland Conservation Act of 1991 including any and all amendments to it. 6.8 Models/Methodologies/Computations. Hydrologic models and design methodologies used for the determining runoff characteristics and analyzing storm water management structures must be approved by the city engineer. Plans, specifications and computations for storm water management facilities submitted for review must be sealed and signed by a registered professional engineer. All computations must appear on the plans submitted for review, unless otherwise approved by the city engineer. 6.9 Variance. Where in the judgment of a registered professional engineer, experienced in the field of storm water and erosion and sediment control, site conditions warrant or where the practices or practice standards will be insufficient to control erosion and sedimentation for a land disturbance activity, the city engineer may grant a variance from this ordinance on a case- by-case basis. The content of a variance must be specific, and must not affect other approved provisions of a plan. A.) The variance request must be in writing. B.) The variance must be in writing and include the reason for granting the variance. 6.10 Special Trout Stream Watershed Requirements. A.) There must be no increase in either the volume or rate of storm water runoff for any design storm with a statistical recurrence interval of less than ten (10) years (i.e., the two (2) year, five (5) year, etc. storm events), unless diversion is not practical and/or the soil is not suitable for storm water infiltration techniques. (Commentary: The intent is to encourage either storm water infiltration or diversion, since urban trout streams are a unique resource. Residential development increases the total volume of runoff resulting from a given storm. Since there is a larger volume of water to deal with, limiting the rate of storm runoff to predevelopment rates means that high flows (and therefore souring velocities) will persist for longer periods of time than during predevelopment conditions. This increases 15