Density in a PD shall be determined by using the “developable land” of the entire proposed development. Developable land is land under thirty percent (30%) slope which is capable of being improved with landscaping, recreational facilities, buildings, or parking. Land devoted to street usage in PD subdivisions shall not be considered developable acreage and must be subtracted out of the total acreage used to determine density. Refer to Figure 14.31.070 at the end of this Chapter.