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<br />Maps and Aerial Photoqraphs <br /> <br />. <br /> <br />Elbert County Base and Index Maps <br /> <br />Three maps of Elbert County are presented in this report. The primary highway system <br />and principal towns are shown in the base map Appendix Figure 2. The U.S. Geological <br />Survey topographic maps that cover the county are shown in Appendix Figure 3 and <br />are indexed by row letter and column number. Aerial photographs also are available for <br />western Elbert County; the roll and exposure number of each photograph are indicated <br />in the index map (Appendix Figure 4). <br /> <br />Flood-Prone Area Base Maps <br /> <br />U.S. Geological Survey 7.5-minute topographic maps (also called quadrangle maps) <br />were used to show the flood-prone areas In Elbert County. The maps were cut into four <br />parts. Each part was then enlarged to a scale of 1 inch equals 1,000 feet, and 1 DO-year <br />flood-prone areas were indicated along the larger streams. The individual flood maps <br />show an area of nearly 15 square miles. The maps are indexed by row letter, column <br />number, and quadrant of the original quadrangle used (Appendix Figure 3). Thus, map <br />C-3-NW describes flood boundaries in the northwest part of the Kiowa 7.5-minute <br />topographic map shown as C-3 on the index to topographic quadrangles. For the <br />purpose of this report, the original maps have been reduced to an 11 x17 format. <br /> <br />. <br /> <br />Aerial Photoqraphs <br /> <br />Aerial photographs of Kiowa County were taken in 1977 by the U.S. Agricultural <br />Stabilization and Conservation Service. The ground area shown on each photograph is <br />about 30 square miles and partly overlaps the areas shown on adjacent photographs. <br />The photographs, which were enlarged to a scale of 1-inch equals 1,320 feet (4 inches <br />per mile), show roads and land development as of mid-1977. Other landmarks, <br />including buildings, earthen dams, and even individual trees, may be identified on the <br />selected aerial views. This identification helps the user compare mapped information <br />with conditions in 1977. Aerial photographs of western Elbert County can be viewed at <br />the office of the Elbert County Land Use Administrator, Elbert County Courthouse, <br />Kiowa, Colo. <br /> <br />ENGINEERING METHODS <br /> <br />Hvdroloqv <br /> <br />. <br /> <br />Heavy, intense rainfall anywhere In Elbert County's long, narrow and rather steep <br />drainage basins will cause flooding. The National Weather Service (1973) determined <br />that the 1 DO-year, 6-hour rainfall for Elbert County is 3.4 inches. However, as much as <br />12 Inches fell in about 3 hours southeast of the town of Elbert, on June 17, 1965. The <br />probable maximum 6-hour precipitation for a given 10-square-mlle area in Elbert <br />County is about 22 inches (Matthal, 1969). Flooding also can result from lesser <br />amounts of rainfall on successive days or when storm cells move along already swollen <br />creeks. <br /> <br />5 <br />