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d. Outstanding natural physical features, such as the crest of hills and natural rock outcroppings should be preserved; e. Roads should follow natural topography, wherever possible, to minimize cutting and grading; f. Rezoning of areas to planned unit development is strongly encouraged to enable a wide latitude in lot dimensions and setbacks to better reflect unique hillside development requirements; and g. To provide flexibility in allowed densities when dedicated open space exceeds the minimum requirements and when the open space shown is consistent with the open space indicated on the parks and open space plan. (b) Calculation of average slope (slope analysis). Average slope shall be calculated by the subdivider and indicated on a sketch plat submitted to the city previous to any submittal of a preliminary plat. The city staff shall review the slope areas as indicated with the subdivider and may require adjustments in the designated hillside areas where adjustments may better achieve the purpose statement for hillside areas. Slope analysis: A slope analysis will be submitted for all subdivisions which have slopes exceeding 18 percent for contiguous areas of greater than one acre. • The average slope of hillside areas shall be calculated by the following method: S=0.0023 x I x L/A, where • "S"is the percent average slope; • "0.0023" is a conversion factor, of square feet to acres which includes multiplying by 100 to arrive at percent slope; • "I"is the contour interval(or the vertical distance between adjacent contour lines on the map); • "L"is the total length of contour lines within the subject parcel;and, • "A"is the area in acres of the subject parcel. Step 1: Determine "I,"the contour interval according to plat/map key. This should not exceed 25 feet for good accuracy. Step 2: Determine "L," the total length of the contour lines within the subject parcel by tracing each line with a planimeter and converting to feet,or by calculation using a CADD system. Step 3: Determine "A," area in acres,from the submitted plat. Step 4: Determine "S" by using the above equation. The permitted number of dwelling units can be determined using"S"and applying it to the slope density table. (c) Slope-density regulations;dwelling units. . (1) The development of hillside areas will be controlled based on the number of dwelling units per acre. On the basis of the slope density table, the number of dwelling units falls as slope increases. The maximum number of dwelling units per acre shall be determined by referring to -184 - Batesville Subdivision Regulations