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<br />"^:l" "8 5 <br />uu/.,."". <br /> <br />other examples would include the i,nfluence of land.use practices <br />and of vegetation modification on the bydrologic regimen; the drousht <br />tolerance of various species of phreatopbytes; the relation between <br />depth of water table and consumptive use by vegetation; and the processes <br />involved in natural ground-water recharge from ephemeral stream channels. <br /> <br />Costs are estimated to be $150,000 the first year and $300,000 <br />a year over the next four years. <br /> <br />CLASSIFICATION OF FEDERAL MINERAL LANDS <br /> <br />. <br /> <br />In Arizona, the State which would ccntain the most extensive <br />ma.nagement works contemplated under the Pacific Southwest Water Plan, <br />the Geological SUrvey proposes to accelerate its classification of <br />Federal mineral lands. Classification would conserve useful mineral <br />deposits under confirmed withdrawals and would release barren lands. <br />!!hus, areas of possible conflict between management programs for <br />water and tor minerals would be minimized. <br /> <br />IIm:>lVed in Arizona are about 3,400,000 acres prospective~ <br />valuable for sodium and 140,000 acres tor coal. !!hese lands can be <br />mapped lI.nd classified as to their mineral potential tor about <br />$2,500,000; a 10-year program at a uniform year~ rate of $250,000 <br />should provide needed information in pace with order~ development <br />of al\Y' mineral, mineral-fuel, and mineral-fertilizer resources. <br /> <br />other parts of the Pacific Southwest also contain deposits of <br />potentia.l.q useful minerals. !!here, h~ver, the likelihood of <br />conflict between management programs for water ^ and for minerals is <br />small. Cansequent~, the Federal mineral lands would be classified <br />as an incidental produetof the geologic and mineral-resource investiga- <br />tions to be outlined. <br /> <br />TOPOORAPHIC MAPPING <br /> <br />General Statement <br /> <br />. <br /> <br />!!he follow1!ig proposal for topographic mapping is paced to <br />facilitate general studies involved in the Pacific Southwest Water <br />Plan. It lfould s~~ Federal agencies and the general public with <br />advance map'materials including aerial photograpby and geodetic- <br />control lists, as well as with publiShed maps. <br /> <br />11 <br /> <br />