Definition: average percent of slope (Applicable to Article X - Chapter 5)
FROM 105-01 : average percent of slope The "average percent of slope" of a zoning lot is the average slope of all portions of a zoning lot excluding steep slopes and shall be determined according to the following equation: S = IL x 100 A Where: S - average percent of slope I - contour interval in feet L - combined length of contour lines in feet, excluding those portions bordering or lying within areas having a slope of 25 percent or greater and meeting the definition of steep slope A - gross area in square feet of the zoning lot , excluding those portions of the zoning lot having a slope of 25 percent or greater and meeting the definition of steep slope . For a proposed site alteration on a tract of land not within a zoning lot , the portion of such tract of land owned by the applicant shall be considered to be part of the zoning lot 100 - factor which yields slope as a percentage CALCULATING AREAS HAVING A SLOPE EQUAL TO OR GREATER THAN 25 PERCENT (illustrative example) Example: X = Contour interval in feet = 2 = 8.0 feet 0.25 0.25 Where: X - distance between contour lines which indicates a slope of 25 percent In order to calculate the area having a slope equal to or greater than 25 percent, one can use a map with two-foot contour intervals and a scale of one inch equals 20 feet, as shown in the map in this Section. A 25 percent slope, on a map with two-foot contour intervals, is indicated by contour lines that are 8.0 feet apart, rounded to the nearest tenth (0.1) of a foot. On a map whose scale is one inch to 20 feet, 8.0 feet is represented by 0.4 of an inch, rounded to the nearest tenth (0.1) of an inch. Identify where the contour lines are 0.4 of an inch or less apart. Connect these contour lines (as indicated by the heavy lines on the map) and calculate the area.
Definition: average percent of slope (Applicable to Article XI - Chapter 9)
FROM 119-01 : average percent of slope The "average percent of slope" of a zoning lot is the average slope of all portions of a zoning lot excluding steep slopes and shall be determined according to the following equation: S = IL x 100 A Where: S - average percent of slope I - contour interval in feet L - combined length of contour lines in feet, excluding those portions bordering or lying within areas having a slope of 25 percent or greater and meeting the definition of steep slope A - gross area in square feet of the zoning lot , excluding those portions of the zoning lot having a slope of 25 percent or greater and meeting the definition of steep slope . For a proposed site alteration on a tract of land not within a zoning lot , the portion of such tract of land owned by the applicant shall be considered to be part of the zoning lot 100 - factor which yields slope as a percentage CALCULATING AREAS HAVING A SLOPE EQUAL TO OR GREATER THAN 25 PERCENT (illustrative example) Example: X = Contour interval in feet = 2 = 8.0 feet 0.25 0.25 Where: X - distance between contour lines which indicates a slope of 25 percent In order to calculate the area having a slope equal to or greater than 25 percent, one can use a map with two-foot contour intervals and a scale of one inch equals 20 feet, as shown in the map in this Section. A 25 percent slope, on a map with two-foot contour intervals, is indicated by contour lines that are 8.0 feet apart, rounded to the nearest tenth (0.1) of a foot. On a map whose scale is one inch to 20 feet, 8.0 feet is represented by 0.4 of an inch, rounded to the nearest tenth (0.1) of an inch. Identify where the contour lines are 0.4 of an inch or less apart. Connect these contour lines (as indicated by the heavy lines on the map) and calculate the area.