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<br /> <br />o <br />,-) <br />'""" <br />~ <br />c.n <br />c:J) <br /> <br />i <br />I <br /> <br />I <br /> <br />includes treatment of an additional 64 million acres by 2020. In most <br />cases, the same acre will require treatment more than once during the <br />study period because of development of improved methods, or the limited <br />life of the measure or practice installed. <br /> <br /> <br />Flood Control <br /> <br />The Region is subject to severe and sudden floods, with some flood <br />damage occurring every year. Almost all land sui table for general develop- <br />ment is subject to some degree of flood damage, either from a defined <br />stream or overland flow. The average annual flood damages were estimated <br />at $41 million for 1965 economic and project conditions. With no addi- <br />tional flood control measures after 1965, annual flood damages of $310 <br />million are estimated by the year 2020. Implementation of the flood <br />control program of structural and nonstructural measures would effect <br />damage prevention so that remaining damages of only $68 million annually <br />are estimated by the year 2020. For these remaining damages there <br />appear to be no feasible solutions. <br /> <br />, <br />i <br />\ <br />I <br />I <br />I <br /> <br />Irrigation and Drainage <br /> <br />Irrigated land is expected to increase from the 1965 level of <br />1,315,000 11 to 1,6i3,000 acres. Urbanization is expected to remove <br />204,000 acres from production. The total new irrigation development <br />would be, 502,000 acres. The program includes completion of the reha- <br />bilitation of existing water conveyance systems for 429,000 acres of <br />presently irrigated lands and new distribution systems to serve <br />1,075,000 acres, a portion of which is presently irrigated exclusively <br />from ground water. Onfarm water management measures such as land <br />leveling and water control structures are recommended for about 2.2 <br />million acres during the study period. The 2.2 million acres include <br />retreatment of some land because of the expected improved technology <br />and limited life of the structures and measures. These measures are <br />to provide better control and more efficient use of irrigation water <br />and/or to reduce costs of irrigation. New drainage facilities are <br />included to serve 188,000 acres. <br /> <br />Municipal and Industrial Water <br /> <br />The rapidly increasing population will require that water for <br />municipal and industrial uses be increased from a 1965 level of <br />450,000 acre-feet to 2.8 million acre-feet in year 2020. Presently <br />authorized projects will supply 446,000 acre-feet of additional water <br /> <br />y <br /> <br />Includes only those acres actually irrigated in 1965 plus the <br />acreage double cropped. <br /> <br /> <br />iv <br />