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Chapter 153 Water Resource Management Adopted 6/28/2022 <br /> Page 25 of 34 <br />(a)Reference Point. The setback width will be measured from: <br />(i)The delineated wetland edge for wetlands; For wetlands without an approved wetland <br />boundary and type, the wetland boundary shall be determined based on aerial review. NWI <br />mapping may be used if aerial photography is not available. <br />(ii)The top of bank for streams and rivers. <br />(iii)The ordinary high-water level (OHWL) for lakes; For lakes without an approved OHWL, the <br />water’s edge as determined based on aerial review shall be used. <br />(b)Base Width. The base width for a transition setback is 20 feet for wetlands and 30 feet for lakes <br />and streams. <br />(c)Minimum Width. The minimum width for a transition setback is: <br />(i)30 feet for lakes and streams <br />(ii)30 feet for wetlands that receive a ranking of “High” value in the Carver County Wetland <br />Function and Value Assessment or an equivalent wetland function and value assessment. <br />(iii)20 feet for wetlands, except for “High” value wetlands. <br />(d)Applied Width. The setback width shall be adjusted to reflect site conditions based on the <br />criteria below. The maximum applied width is 50 feet. <br />(i)Stormwater treatment. The base width must be increased by 10 feet in areas where <br />untreated stormwater runoff from impervious surfaces is directed to the surface water and <br />not stormwater BMPs. <br />(ii)Slopes. For every 5 percent increase in average setback slope from 5 percent, the base width <br />must be increased 5 feet in the area where the slope increase exists. <br />Average Setback Slope Increase in Setback Width <br />0-5% slope No increase <br />5-10% slope Add 5 feet to Base Width <br />10-15% slope Add 10 feet to Base Width <br />>15% slope Add 15 feet to Base Width <br />(e)Flexibility in Applied Width. The county retains the right to allow the setback width to vary and <br />the minimum width to be reduced based on demonstrated site constraints, to allow unique <br />BMPs, or to allow other activities that protect and enhance the surface water resource. <br />Adjustments to the applied width may not result in a reduction to the total setback area and the <br />adjusted setback must provide surface water protection at least equivalent to a setback of <br />uniform width (e.g. the setback area may be reduced in one area adjacent to the surface water if <br />the area is replaced at a 1:1 ratio elsewhere around the same resource). <br />(f)Subject to county approval, the total setback area may be reduced if the area is replaced at a 2:1 <br />ratio around another surface water of comparable value on site. <br />(g)Linear Projects. For linear projects, non-impervious portions of the right of way are allowed <br />within the setback.