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-7- • FEASIBILITY ANALYSIS Area Capable of Being Irrigated The area capable of being flood irrigated is determined by first delineating the unconsolidated alluvial deposits of Sudduth, Williams, Bush and Bolton Draws. This data was provided by Kerr Coal Company on maps having scales of 1 inch = 2000 feet and 1 inch = 500 feet (Kerr Coal Company Map Nos. 5 and 6). For the areas where detailed topographic mapping having a scale of 1 inch = 200 feet and 5 foot contour interval was available, the unconsolidated alluvial deposits limits were transferred. Lands topographically suitable for irrigation were delineated using U.S. Bureau of Reclamation criteria for Class 3 irrigable lands which includes areas having less than a 12 percent slope. A gravity ditch delivery system was laid out to serve the areas topographically suitable. Some areas which contain unconsolidated alluvial • deposits cannot be flood irrigated due to their close proximity to the draws, the presence of roads, etc. Other areas were excluded because of their small size. In the four draws, there are a total of 290.7 acres of land meeting the topographic criteria that could be flood irrigated by a gravity delivery system. Table 3 summarizes the total area of unconsolidated alluvial deposits and the practicable irrigable area for each draw. For the 290.7 acres of irrigable land and a unit irrigation water requirement of 3.46 acre-feet per acre the annual irrigation water requirement would be 1005.8 acre-feet for the four draws. Reservoirs Because of the difference between the period of surface • runoff and the irrigation demand, it is necessary to provide reservoir storage to even out the distribution of the water supply. fC1 Leonard Rice Consulting Water Engineers, Inc.