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35 <br /> will not include the surface of any street existing <br /> on April 2, 1990 unless the street is upgraded to a <br /> greater width. In such cases, only the additional width <br /> shall be included in calculating the impervious surface <br /> coverage. <br /> It is the intent of this section that the impervious <br /> surface limitations specified herein shall apply to the <br /> entire tract to be developed. Therefore, if the <br /> subdivision involves the creation of any street or other <br /> impervious surface outside the boundaries of the lots so <br /> created, then the total impervious surface allocation <br /> may be determined as follows: <br /> a. The total area of permissible impervious surface <br /> for the entire subdivision shall be calculated, <br /> applying the percentage limitations set forth in <br /> Table 6 .25 .4. <br /> b. From the total area calculated pursuant to a. <br /> above, there shall be subtracted the impervious <br /> surface area within streets and other areas outside <br /> of the individual lot boundaries. <br /> c. Following the calculation set forth in b. above, <br /> the remaining permissible impervious surface shall <br /> be allocated equally to each lot by the subdivider <br /> or as may be approved by the Zoning Officer. The <br /> allocation shall be indicated on a separate <br /> document recorded together with the final <br /> subdivision plat. <br /> For conventional subdivisions to be developed in <br /> accordance with the provisions of Article 6.25. 1 and <br /> cluster subdivisions to be developed in accordance with <br /> the provisions of Article 6 .25. 3, an impervious surface <br /> limitation of four percent (4%) [or six percent (6%) ] <br /> shall apply to the entire tract to be developed. For an <br /> existing lot of record to be developed in accordance <br /> with the provisions of Article 6.25.2b. , the full range <br /> of impervious surface ratios specified in Table 6.25.4 <br /> is applicable. <br /> 6.25.5 Steam puffers Required <br /> The effective use of buffer zones along streams can <br /> increase the overall factor of safety associated with a <br /> watershed protection plan. By preventing development <br /> from encroaching on streams, buffer zones can help <br /> minimize stream channel erosion downstream of <br /> development. If properly situated and kept in <br /> undisturbed natural vegetation, buffer zones will <br /> receive sheetflow runoff; i.e. , runoff which flows <br /> slowly in a spread out pattern rather than being <br />