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<br />C'J <br />- <br />M CHAPTER III BASIS FOR ANALYSES <br />C\l <br />-, Arable land serviceable by project <br /> (acres) <br /> Little Flag Josephine Milk <br /> Beaver Creek Basin Creek Total <br /> Irrigated <br /> Class 2 1,010 1,700 20 1,650 4,380 <br /> Class 3 600 1,680 1,530 3,810 <br /> Subtotal 1,610 3,380 20 3,180 8,190 <br /> Nonirrigated <br /> Class 2 4,740 930 2,260 4,870 12,800 <br /> Class 3 7,430 1,940 2,030 6,790 18,190 <br /> Subtotal 12,170 2,870 4,290 11,660 30,990 <br /> Total 13,780 6,250 4,310 14,840 39,180 <br /> <br />About 8,190 acres of the arable land is cultivated and irrigated, <br />about 12,000 acres cultivated but not irrigated, and about 18,990 acres <br />still with native cover. All of the arable lands are in classes 2 and <br />3. No lands were determined to be class I because of the relatively <br />short growing season in the project area. <br /> <br />Lands in the project area have a wide range of topographic and soil <br />conditions. Slopes are generally about 5 percent on the fans and terraces <br />and 1 to 2 percent on the flood plains or vall~y floors. Arable areas be- <br />tween the various land forms have slopes up to 12 percent. In nonarable <br />areas slopes often exceed 12 percent. The soils are gray brown to reddish <br />brown. They are principally alluvial and have generally good structure, <br />good water-holding capacities, and low alkali and salt content. <br /> <br />Drainage <br /> <br />Land characteristics in the project area are generally favorable <br />to good natural drainage. It is estimated that some localized areas, <br />almost equally divided between the White River and Milk Creek Segments, <br />might develop drainage deficiencies if project water were applied to <br />them. These deficiencies are anticipated where unfavorable topographic <br />conditions or shallow depths to bedrock exist and where soils of low <br />permeability retard ground water movement. <br /> <br />The deficient lands would be provided with drains as a part of proj- <br />ect development. In addition to the project drainage some farm drainage <br />may be required for removal of excess surface water on individual farms. <br />The farm drainage, however, would be the responsibility of the individual <br />landowners. <br /> <br />Farm size and excess lands <br /> <br />The irrigated land required for efficient farm operation would be <br />in excess of the 160 acres for ",hich ,.mter could be provided from a Federal <br /> <br />24 <br />