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7 001298 In general, artifical ground water recharge from available surface water flows appears to have only a very limited potential in Arizona. Under Arizona law surface water flow is subject to appropriation, and practically all surface flow water has long since been appropriated and put to use. INDUSTRIAL USE OF WATER Arizona has not attracted heavy industry which uses large amounts of water. Except for mining, most of the industrial use of water is for cooling. Fortunately, Arizona's mining industry has adopted a very enlightened and responsible attitude toward water use efficiency and conservation. It is estimated that for every l, 000 gallons of new water used by the mining industry in Arizona, 3,000 gallons are reused. By treatment processes some water is reused as many as seven times. New water costs the mining industry an estimated 17<:: per 1,000 gallons. The cost of its reclaimed water is about 3. S<:: per 1,000 gallons. LOOKING AHEAD To conserve water Arizona users will try anything that even remotely shows promise of success. Artifical precipitation (cloud seeding) has been tried both under contracts with groups of private landowners and with organized irrigation districts. The Institute of Atmospheric Physics at the University of Arizona conducts a sustained research program aimed at a basic understanding of atmospheric fac- tors which determine climate, and the potential for inducing increased precipitation on watersheds. Evidence of predictable and dependable results has not been pro- duced, but research continues with full public support. Experiments with monomolecular films to reduce evaporation losses from reservoirs and stock tanks are bing conducted in Central Arizona and, although results have been disappointing, the tests continue, with IDth private and public funds. Research and applied management to eliminate waste of water along stream channels by vegetative evapo-transpiration has been pioneered in Arizona. Most recent program is an intensive test by the U. S. Geological Survey on a IS-mile stretch of the Gila River that is infested by water-wasting salt cedars. It is enthusiastically encouraged by water user groups and the Watershed Management Division of the State Land Department. Irrigation practices are constanting being evaluated by the College of Agriculture at the University of Arizona, the SCS and other agencies, to the end that irrigation may provide optimum crop plant requirements with as little water los s as pos sible.