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PAGE.2. <br /> prevents the natural infiltration of water into the soil. Impervious <br /> surfaces shall include both paved and unpaved surfaces, including, but not <br /> limited to, streets and parking areas, driveways, sidewalks, patios, and <br /> structures which cover the land. <br /> In order to promote the infiltration of stormwater runoff into the soil and <br /> to minimize direct and immediate runoff into streams and University Lake <br /> reservoir, impervious surface ratios shall be required as provided in the <br /> Table of Impervious Surface Ratios for University Lake Watershed - Section <br /> 6.25.4 <br /> Impervious surface calculations for an individual lot shall be cumulative, <br /> including the original construction and any subsequent additions thereto. <br /> The calculation of impervious surface coverage for an individual lot shall <br /> also include one-half of the street surface on which the lot fronts or <br /> abuts; provided, however, the impervious surface calculation will not <br /> include the surface of any street existing on April 2, 1990 unless the <br /> street is upgraded to a greater width. In such cases, only the additional <br /> width shall be included in calculating the impervious surface coverage. <br /> It is the intent of this section that the impervious surface limitations <br /> specified herein shall apply to the entire tract to be developed. <br /> Therefore, if the subdivision involves the creation of any street or other <br /> impervious surface outside the boundaries of the lots so created, then the <br /> total impervious surface allocation may be determined as follows: <br /> a. The total area of permissible impervious surface for the entire <br /> subdivision shall be calculated, applying the percentage limitations set <br /> forth in Table 6.25.4. <br /> b. From the total area calculated pursuant to a. above, there shall be <br /> subtracted the impervious surface area within streets and other areas <br /> outside of the individual lot boundaries. <br /> c. Following the calculation set forth.in-b. -above, the remaining -- -. - <br /> permissible impervious surface shall be allocated equally to each lot-by - - . <br /> the subdivider or as may be approved by the Zoning Officer. The <br /> allocation shall be indicated on a separate document recorded together <br /> with the final subdivision plat. <br /> For conventional siubdivisions _to be. developed-in accordance with the provisions of Article 6.25.1 and cluster subdivision to be developed in <br /> accordance with the provisions of Article 6.25.3 an impervious surface <br /> limitation of four percent (4%) (or six percent (6%)) shall apply to the <br /> entire tract to be developed. For an existing lot of record to be developed <br /> in accordance with the provisions of Article 6.25.2b, the full range of <br /> impervious surface ratios specified in Table 6.25.4 is applicable. <br /> 6.25.5 Stream Buffers Required <br /> The effective use of buffer zones along streams can increase the overall <br /> factor of safety associated with a watershed protection plan. By preventing <br /> development from encroaching on steams, buffer zones can help minimize <br /> stream channel erosion downstream of development. If properly situated and <br />