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15 <br /> <br />Slide #18 1 <br /> 2 Christopher Sandt, County Engineer, continued the presentation. He indicated that 3 <br />everything in the northeast corner of the county drains to Falls Lake. He pointed out the thick blue 4 <br />line in the middle of the map as the break line between the Jordan Lake Basin and the Falls Lake 5 <br />Basin. He said there is a small section in the northern part of the county that drains up to the 6 <br />Roanoke Basin in Virginia. He said the light blue areas on the map are the protected watersheds, 7 <br />and the darker blue areas are the critical watersheds. He explained that the darker blue 8 <br />watersheds are adjacent to the water supply reservoirs. After reviewing the acronyms on the slide, 9 <br />Christopher Sandt explained the difference between density and impervious surface. He said the 10 <br />number of dwellings per unit of land is density, while impervious surface limits are the actual 11 <br />percentage of impervious area on a particular parcel as it relates to the overall size of the parcel. 12 <br />He said the lightest areas of the map do not specifically have lot density and impervious surface 13 <br />area requirements, but the county does manage stormwater and erosion control for those areas. 14 <br />He said there are also stormwater and erosion control requirements for every watershed in the 15 <br />county. 16