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43 <br />44 <br />45 <br />f. Biological and ecological functions. The functions of vegetation in stabilizing soils and slopes, <br />retaining and filtering runoff, providing habitat, and recharging groundwater. <br />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 />51 <br />52 <br />53 <br />54 <br />55 <br />56 <br />57 <br />58 <br />59 <br />60 <br />61 <br />Bluff and Bluff Impact Zone <br />Bluff [Impact Zone <br />20 ft 25ft <br />FIw <br />Structure setback - - <br />40-100ft <br />20 ft <br />,18%q slope <br />Top of Bluff or <br />Bluffline <br />Toe of Bluff or <br />OHWL <br />Bluff <br />o25 ft <br />(2) A natural escarpment or cliff with a slope that rises at least ten feet above the ordinary high <br />water level or toe of the slope, whichever is applicable, to the top of the slope, with a slope <br />of 75 degrees or greater. See Figure 2. <br />Figure 2. Natural Escarpment Bluff and Bluff Impact Zone <br />Bluff and Bluff Impact Zone <br />Bluff Impact Zone <br />20ft 20ft <br />r- Structure setback <br />1 40-100 ft <br />Top of Bluff <br />or Bluffline <br />a75 1 <br />degrees <br />11Oft <br />Toe of Bluff <br />or QHWL <br />Bluff <br />h. Bluff impact zone. A bluff and land located within 20 feet of the bluff. See Figures 1 and 2. <br />i. Bluffline. A line delineating the top of the bluff. More than one bluffline may be encountered <br />proceeding landward from the river. See Figures 1 and 2. <br />2 <br />