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1 Management Practices," and the state department of transportation's, "Erosion Control Design <br />2 Manual" for suitable BMPs.) <br />3 Biological and ecological functions. The functions of vegetation in stabilizing soils and slopes, retaining <br />4 and filtering runoff, providing habitat, and recharging groundwater. <br />5 Bluff. A natural topographic feature having: <br />6 (A) A slope that rises at least 25 feet a-n-d where the grade of the slope averages 18 percent or <br />7 greater, measured over a horizontal distance of 25 feet, from the toe of the slope to the top <br />8 of the slope. Where the slope begins below the ordinary high water level, the ordinary high <br />9 water level is the toe of the slope. See Figure 1; or <br />Figure 1. Bluff and Bluff Impact Zone <br />Bluff and Bluff Impact Zone <br />Bluff Impact Zone <br />20ft 25ft <br />�----- Structure setback <br />40-100ft <br />10 <br />z18% slope <br />I Top of Bluff or <br />Btuffline <br />Toe of Bluff or <br />OHWL <br />Tour of ,41 <br />11 <br />Bluff <br />20ft <br />t >_25 ft <br />l _ <br />12 (B) A natural escarpment or cliff with a slope that rises at least ten feet above the ordinary high <br />13 water level or toe of the slope, whichever is applicable, to the top of the slope, with a slope <br />14 of 75 degrees or greater. See Figure 2. <br />5 <br />