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<br /> <br />o <br /> <br />'. ") <br /> <br />.... <br />l..? <br />.:::J <br />t- <br /> <br /> <br />control program of structural and nonstructural measures would prevent <br />a la~ge portion of the damages, so that remaining damages of only $68 <br />mil.1.~on annually are estimated by the year 2020. For these remaining <br />damages, there appear to be no feasible solutions. <br /> <br />Irrigation and Drainage <br /> <br />Irrigated land is expected to increase from the 1965 level of <br />1,315,000 !I to l,6i3,000 acres. Urbanization is expected to remove <br />204,qoo acres from production. The total new irrigation development <br />would be 502,000 acres. The program includes completion of the reha- <br />bilit~tion of existing water conveyance systems for 429,000 acres of <br />presehtly irrigated lands and new distribution systems to serve <br />1,075,000 acres, a portion of which is presently irrigated exclu- <br />si vely from ground water. Onfarm water management measures such as <br />land leveling and water control structures are recommended for about <br />2.2 million acres during the study period. The 2.2 million acres <br />include retreatment of some land because of the expected improved <br />technology and limited life of the structures and measures. These <br />measures would provide better control and more efficient use of irri- <br />gatio~ water and/or would reduce costs of irrigation. Newdrainage <br />facilities are 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 />by 2000. Major urban centers would satisfy their additional water <br />requirements through the importation program and through treatment <br />and recycling of waste water. Smaller cOllDlluni ties would fulfill their <br />increas\i.ng needs by a variety of means, including additional surface- <br />and ground-water development, desalting of brackish ground water, and <br />by importation. <br /> <br />Mineral Resources <br /> <br />Adequate mineral resources are available to meet the expected <br />increased production, $511 million in 1965 to $1.93 billion in year <br />2020 (1958 dollars). Water withdrawal requirements would increase <br />from 105,100 to 357,200 acre-feet in this period, while land require- <br />ments would increase from 76,000 acres to 223,000 acres. Environ- <br />mental impacts of the mining and processing of ores will need to be <br /> <br />!I Incl~des only those acres actually irrigated in 1965 plus the <br />acreage double cropped. <br /> <br />I <br />I <br />i <br />, <br />i <br />! <br />J <br />i <br /> <br />xi <br />