(A) The following information shall be provided for any application proposing development on a lot or parcel that includes a slope of at least 10%:
(1) A slope and topographic map based on a certified boundary survey depicting contours at an interval of five feet or less. The map shall indicate, through crosshatching or separate colors, all areas within each slope category described in Table 153.1253(A) of this chapter. Slope determinations shall be made upon areas with a size of 400 square feet or greater in the categories described in Table 153.1253(A) of this chapter;
(2) An analysis of the direction, rate and volume of storm water run-off leaving each area within a slope category described in Table 153.1253(A) of this chapter; and
(3) The location of any existing swales, streams or other watercourses.
(B) The following information shall be provided for any application proposing development on a lot or parcel that includes a slope greater than 15%:
(1) A detailed site analysis of soil conditions;
(2) A detailed site analysis of hydrology;
(3) A detailed site analysis of bedrock conditions; and
(4) A detailed site analysis of any other engineering and environmental considerations as may be required by the Code Enforcement Officer in order to determine whether the proposed development will create a threat to the public health, safety and general welfare or cause land subsidence, erosion or increases in the rate of volume of storm water entering adjoining properties.
Slope Category | Illustration | Development Restrictions |
Less than 10% | No additional building restrictions pursuant to this section. | |
10% to 15% | Site preparation techniques shall be utilized that minimize grading and site disturbance. | |
Greater than 15%, less than 25% | Building and site preparation may occur upon demonstration of specialized site design techniques and approaches as described in § 153.1254 of this chapter. | |
25% or higher | Generally unsuitable for development. Land disturbance shall not exceed 25% of the area containing 25% or greater slopes unless a variance is granted by the Board of Adjustment. For disturbed areas, building and site preparation shall utilize specialized site design techniques and approaches as described in § 153.1254 of this chapter. | |
(Ord. 3020, passed 9-10-2013, § 5.41.3)