Agenda - Planning Commission - 04/27/2023

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1 Management Practices," and the state department of transportation's, "Erosion Control Design 2 Manual"for suitable BMPs.) 3 Biological and ecological functions. The functions of vegetation in stabilizing soils and slopes, retaining 4 and filtering runoff, providing habitat, and recharging groundwater. 5 Bluff means a topographic feature such as a hill, cliff, or embankment having the following characteristics 6 (an area with an average slope of less than 18 percent over a distance for 50 feet or more shall not 7 be considered part of the bluff): 8 (1) Part or all of the feature is located in a shoreland area; 9 (2) The slope rises at least 25 feet above the ordinary high water level of the water body; 10 (3) The grade of the slope from the toe of the bluff to a point 25 feet or more above ordinary high 11 water level average 30 percent or greater; and 12 (4) The slope must drain toward the waterbody. 13 Bluff. A natural topographic feature having: 14 (A) A slope that rises at least 25 feet and where the grade of the slope averages 18 percent or 15 greater, measured over a horizontal distance of 25 feet, from the toe of the slope to the top 16 of the slope. Where the slope begins below the ordinary high water level, the ordinary high 17 water level is the toe of the slope. See Figure 1; or Figure 1. Bluff and Bluff Impact Zone Bluff and Bluff Impact Zane t I I Bluff Impact Zone E 1 I [ I I P I I I I 20 ft 25 ft 20 ft I E 1--- ►I [ I 1 ) I i- Structure setback-----=-' 1 I z1$%slope i 40-100ft i 1 i I I i 1 f 1 Top of Bluff or I >_25 ft Biuffline t I 1 1 1 I 1 I 1 Toe of Bluff or l I OHWL I ! � I Muff 1 18 y. �- 3S 1 Isft 'Toe of svve ct ONWt 19 20 (B) A natural escarpment or cliff with a slope that rises at least ten feet above the ordinary high 21 water level or toe of the slope, whichever is applicable, to the top of the slope, with a slope 22 of 75 degrees or greater. See Figure 2. Page 5 of 147