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39 <br /> c) Land Disturbance and Planting of Vegetation <br /> 1) Area within a stream buffer which is subject to serious erosion may be <br /> disturbed for the purpose of planting and maintaining erosion-resistant <br /> vegetative cover. <br /> 2) Existing forested areas or any other healthy vegetation cannot be removed <br /> from a stream buffer, except where replaced with vegetation resulting in <br /> comparable stormwater runoff velocity and quantity one year after <br /> planting. <br /> 3) New vegetation shall be planted to capture non-source pollutants before <br /> they reach the perennial stream, as per applicable Orange County <br /> Standards. <br /> d) Calculating Width of Stream Buffer <br /> 1) How to Calculate Slope <br /> a. Draw a line perpendicular to the stream. <br /> b. Determine the elevation at the stream itself (1), and at the point <br /> 250' from the stream along the perpendicular line (2). <br /> c. Subtract (1) from (2). <br /> d. Divide c. by 250. <br /> e. Multiple d. by 100 <br /> Hereinafter, the number derived in e. will be referred to as "slope value". <br /> 2) Method A - Stream Buffer Based on Slope <br /> The width of the buffer shall be fifty (50) feet from each edge of the <br /> floodplain, plus the slope value multiplied by four. <br /> 16 <br />