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43 f. Biological and ecological functions.The functions of vegetation in stabilizing soils and slopes, <br /> 44 retaining and filtering runoff, providing habitat,and recharging groundwater. <br /> 45 g. Bluff.A natural topographic feature having: <br /> 46 (1) A slope that rises at least 25 feet and the grade of the slope averages 18 percent or greater, <br /> 47 measured over a horizontal distance of 25 feet,from the toe of the slope to the top of the <br /> 48 slope.Where the slope begins below the ordinary high water level,the ordinary high water <br /> 49 level is the toe of the slope.See Figure 1;or <br /> 50 Figure 1. Bluff and Bluff Impact Zone <br /> Bluff and Bluff Impact Zone <br /> Bluff Impact Zone <br /> 20ft 25ft 20ft. <br /> f � <br /> 1---Structure setback e18%slope <br /> I 40-100ft <br /> I <br /> Top of Bluff or 225 ft <br /> Bluffline <br /> Toe of Bluff or <br /> OHWL <br /> Bluff <br /> 51 <br /> 52 (2) A natural escarpment or cliff with a slope that rises at least ten feet above the ordinary high <br /> 53 water level or toe of the slope,whichever is applicable,to the top of the slope,with a slope <br /> 54 of 75 degrees or greater.See Figure 2. <br /> 55 <br /> 56 Figure 2. Natural Escarpment Bluff and Bluff Impact Zone <br /> Bluff and Bluff Impact Zone <br /> Bluff Impact Zone <br /> 20ft 20ft <br /> L. <br /> �---Structure setback-------� <br /> >75 I <br /> 40-100ft degrees <br /> I >_70 ft <br /> Top of Bluff <br /> or Bluffline <br /> Toe of Bluff <br /> or OHWL <br /> Bluff <br /> 57 <br /> 58 <br /> 59 h. Bluff impact zone.A bluff and land located within 20 feet of the bluff.See Figures 1 and 2. <br /> 60 i. Bluffline.A line delineating the top of the bluff. More than one bluffline may be encountered <br /> 61 proceeding landward from the river.See Figures 1 and 2. <br /> 2 <br />