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attached Exhibit 1 document shows field notes and benchmark information from the <br /> County/WDNR elevation transfer. <br /> • The available lake floodwater storage capacity will be considered as the normal lake r <br /> surface area projected vertically (linear stage-storage relatlonshlp} which <br /> conservatively does not account for Rood water storage in areas on the landward <br /> side of the water line. <br /> Watershed Area—T000aranhv ; <br /> The watershed arm was determined using ArcMap and the USGS quadrangle mapping. <br /> The area contributing surface water runoff was determined to be 1160 acres. The attached <br /> Exhibit 2 document shows the watershed area. <br /> Watershed Anna—Land Use <br /> Land uses within the watershed were determined by using aerial photography(Year 2008 <br /> NAiP). The following assumptions regarding land use were made: <br /> • The lake area as it appears on the aerial photo and the DNR take Survey map Is <br /> considered to be the base lake area. A large area on the northern end of the lake � <br /> and a small area at the far southwest comer of the lake appear as water on the <br /> USGS map, but as open wetlands on both the aerial photo and the DNR Lake 3 <br /> Survey Map. For this reason these areas are considered to be wetland—see next I} <br /> bullet point. <br /> • Areas appearing as open space on the aerial photo and marked with marshsymbols <br /> on the USGS quadrangle map were considered wetlands. <br /> • Other small scattered areas of open space that do'not appear as marsh on the € <br /> USGS quadrangle have not been explicitly delineated,and are assumed to'make'UP <br /> 2%of the tial watershed. <br /> • Based on the aerial photo approximately.756?o of the lake shoreline has beam <br /> -developed. Development consists of medium-density lot development <br /> (approximately 30%impervious)on wooded lots,extending from the shoreline to a <br /> distance 250' back han'the shoreline. <br /> • Ali other areas are heavily wooded. <br /> Land use areas are presented In the following table. The attached Exhibit 3 document i <br /> shows the aerial photo and land uses. 332 <br /> (} <br /> acres <br /> An. <br /> - - ala atlan Ana - 14 <br /> Arae <br /> AWices in'tlllno*knva,Wnnssota,andWiscorrsin <br /> 2901 International tare. Suite-300, Madison,WI 53704-3133 <br /> (608)242-7779 (600)446-0679 <br /> FAX (608)242-5664 WEB ADDRESS: www.mas.00m <br /> i' <br />