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Article 6: Development Standards Section 6.13: Stream Buffers Orange County, North Carolina – Unified Development Ordinance Page 6-96 6.13.2 Applicability The stream buffer regulations and standards contained herein shall be applicable to all streams and water features, as follows: (A) Streams identified by any of the following means: (1) Shown as solid blue lines or as broken blue lines on the USGS Quadrangle maps, (2) Shown as water feature in the Orange County Soil Survey, or (3) A water feature identified by a field determination of County staff trained in surface water identification through the North Carolina Division of Water Quality (NCDWQ). (B) Steam buffers shall extend around the perimeter of all water features if any portion of the stream buffer of a stream touches the water feature. Disputes pertaining to water feature decisions by County staff shall be filed directly to the NCDWQ. 6.13.3 Calculating Width of Stream Buffer (A) Special Flood Hazard Areas Zoning Overlay Districts & FEMA Floodplains (1) Those streams identified by FEMA as having floodplains shall have stream buffers calculated from the outside edges of the 100-year floodplain. (B) Calculating Slope Value (1) Draw 250’ length perpendicular lines, at 200-foot horizontal intervals along the entire length of the outside edges of the stream, or the outer edge of the FEMA floodplain, whichever is greater. (2) Determine the elevation at either the stream bank or the outer edge of the FEMA floodplain, whichever is highest (Elevation 1), and at the point 250’ from the stream or FEMA floodplain, whichever is applicable, along the perpendicular line (Elevation 2). (3) Subtract Elevation 1 from Elevation 2 for the Difference. (4) Divide the Difference by 250 for the Mean. (5) Multiply the Mean by 100 to determine the “Slope Value”. (6) Perform this calculation for both sides of the stream or floodplain. 137