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