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I I I I I I I I I I I I I I I I I I I B. Study Limits The area to be studied includes the East and West Douglas Wash watersheds, which are in the Moulton Valley of Unincorporated Clifton. The study limit for the East drainage begins near the southeast corner of Section 35, TIN, RIE, to near its confluence with the Colorado River, and the West drainage's study limit starts from the top of SE ~ of Section 35, TIN, RIE, to the center of SE ~ of NE ~ of Section 13, TIS, R2E. These include the following reaches: R~ach r~ngth East Douglas Wash Main Channel 3.1l Miles North Branch 0.66 Miles West Douglas Wash Main Channel 2.04 Miles Reach 1 East 0.02 Miles Reach 1 West 0.30 Miles Total Reach Length 6.l3 Miles An index map showing the location of flood plain mapping is included as figure 2. The flood plain maps themselves are shown as sheets 1 through 23 following the index map. RELATED FLOOD STUDIES No detailed flood studies have been made previously for this study location. FLOOD HISTORY Storms which produce flooding along the northern part of East and West Douglas Washes occur from April through October. These storms are often characterized by high rainfall intensities of short duration, producing high peak flows and moderate volume of water. Frequently, the thunderstorms are severe and occur over limited areas. Historical documentation of flood damage is meager. This is probably due to the small size of the streams and lack of extensive urbanization. Major flood damages in the watershed are to roads, agricultural lands, and residential homes. Duration of flooding is brief because of the small size of drainage area. In general, peak flows last from one to three hours during a flooding period from six to twenty-four hours. 5