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6.25. 5 was derived to provide a sliding scale for buffer <br /> zone widths based on slope and vegetative cover. <br /> TABLE 6 .25 .5 REQUIRED BUFFER ZONE WIDTHS <br /> ALONG PERENNIAL AND INTERMITTENT STREAMS <br /> IN UNIVERSITY LAKE WATERSHED <br /> Type of Groundcover <br /> Grass Woods <br /> Slope (Ft) (Ft) <br /> 2% to 4 . 9% 100 50 <br /> 5% to 6 . 9% 150 100 <br /> 7% to 9 . 9% 150 100 <br /> 10% to 14 . 9% 200 100 <br /> 15% or greater 250 150 <br /> The required stream buffer zone shall start at the <br /> stream bank and be measured away from the stream for a <br /> distance depending upon the slope and the vegetative <br /> cover near the stream. The slope shall be calculated by <br /> measuring a distance of 250 feet from the stream bank, <br /> determining the rise in elevation in that distance, and <br /> dividing the rise in elevation by the distance of 250 <br /> feet. Based on the resulting slope calculation and the <br /> type of vegetative cover near the stream, the applicable <br /> buffer zone width may be determined from Table 6 .25 .5 . <br /> Slope shall be determined from the USGS quadrangle maps <br /> for Orange County, by on-site measurements or by special <br /> survey by a registered engineer or surveyor. <br /> The required stream buffer zone shall not be limited to <br /> one calculation but shall be based on calculations made <br /> at points where topographical and ground cover <br /> conditions change based on an analysis of the site. <br /> In addition to the buffer zone resulting from the above <br /> calculations, a stream buffer shall include any portion <br /> of a floodplain as defined in the Orange County Flood <br /> Damage Prevention Ordinance, by special survey by a <br /> registered engineer or surveyor or by alluvial soils as <br /> designated in the Orange County Soils Survey. <br /> 6.25 .5 . 2 Buffer Zones Included As Part Of Minimum Lot Size <br />