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• <br />• <br />C. Wet ponding credit - An adjustment of up to twenty -five percent (25 %) will be <br />made to the storm water utility fee of a parcel for onsite measures which are owned and <br />maintained by the applicant that effectively reduces the amount of sediments /nutrients that <br />enter the system. No adjustments will be made to single family, duplex residential, and <br />agricultural parcels. It is the responsibility of the applicant to prove that the wet pond in <br />question meets the following design criteria. <br />I. Permanent Pool Volume: The volume of the permanent pool ( "dead storage ") should <br />be at least 1.3 and preferably up to 2.5 times greater than the runoff volume generated <br />from a 0.34 inch rainfall event (average summer storm) over the pond tributary area. <br />II. Permanent Pool Depth: To promote settling and provide space for sediment <br />accumulation, the average depth (volume /area) of the permanent pool should be at least <br />4 feet with a maximum depth of 10 feet. <br />III. Pond Shape: The pond should be wedge shaped, narrowest at the inlet and <br />widest at the outlet. A minimum length to width ratio of 3:1 should be used. The <br />distance between storm sewer outfalls and the pond outlet should be maximized to <br />prevent short- circuiting. <br />• IV. Detention Time: The pond should provide a detention time of at least 6 hours. <br />V. Skimming: The pond should have some type of facility to retain oils and floatable <br />debris. This facility will be maintained by the applicant. Skimming shall be considered <br />adequate if a baffle structure extends at least 4 inches below the normal water surface <br />and the velocity of water passing under the baffle does not exceed 0.5 feet per second <br />for the one year rainfall event. <br />VI. Emergency Overflow: An emergency overflow structure or stabilized spillway <br />will be provided to accommodate discharges during a storm event greater than a 2.5 <br />inch rainfall. <br />VII. Side Slopes: For purposes of stability, the side slopes should not exceed three <br />feet horizontal to one foot vertical. <br />The motion for the adoption of the foregoing resolution as duly seconded by Councilmember <br />Anderson, and upon vote being taken thereon, the following voted in favor thereof: <br />Mayor Gamec <br />Councilmember Connolly <br />Councilmember Anderson <br />Councilmember Hendriksen <br />Resolution #00 -07 -172 <br />Page 2 of 3 <br />