87.1135 Design Criteria. — Yucaipa Zoning Code

(a) The slope and natural open space relationship below is used to determine natural open space dedication requirements for development projects based on the slope of the land. One column defines the percentages of slope within a project that are to be categorized. The other column indicates the proportion of each slope category that must be left as natural open space.

Slope Category (%) Slope Category (%) 0 - 15 15.1 - 20 20.1 - 25 25.1 - 30 30.1 - 35 35.1 - 40 40.1 +	Minimum Percent of Open Space Left Natural
	Minimum Percent of Open Space Left Natural
	0 50 60 70 80 90 100

(b) The relationship is designed so that as the steepness of the land increases, the open space requirement increases. This encourages development on rugged environmentally sensitive terrain to be concentrated or intensified in the most appropriate areas of the site. It does not necessarily, however, prohibit development on steep slopes, nor does it necessarily reduce the permitted density.

(d) The method of calculating the percent slope of any piece of land involves plotting the land on a topographic base map and dividing the vertical rise between contours by the horizontal distance between the same contours, multiplied by 100. A slope map shall be prepared and submitted with any residential development application. The slope map shall include the following information:

(1) A topographic map of the proposed project area and all adjoining properties within 150 feet at a scale of not less than one (1) inch to two hundred (200) feet. The contour interval shall be not more than two (2) feet except that the contour interval may be five (5) feet if the general slope is more than ten (10) percent.

(2) The topographic map shall be prepared and certified by a Registered Civil Engineer or a Professional Land Surveyor.

(3) Land within each slope category, e.g., zero (0) to fifteen (15) percent, shall be delineated. The area in acres shall be tabulated for each category.

(4) Steeply incised drainage channels with near-vertical walls shall not be included in the slope calculations for the purpose of tabulating the cumulative acreage of each slope category.

(e) The amount of land to be left in natural open space for any given project is computed by multiplying the number of acres of the project area within each slope category by the required percentage of natural open space for that category. The totals for each category are then summed to yield the total natural open space requirement for the project. (Amended by Ord. 313 §§ 5—7, 2011; Ord. 269 §§ 2, 5, 2007)