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002281' ",1 A Long-range Program Outlined below are principal categories at additional 1nvestl&!,- tions proposed by the Geological Survey to foster and sustain full develO]illleJ1t at water resources in the Pacific SOUthwest. Costs, above those of the current program that bas been sUllllll8rized, would be about $1,000, ()O()lt in the first ,.ear and about $2,000,000 ,.ear17 f1'Olll the second through the fifth year. After five ,.ears, scope and cost would be reconsidered according to experience. . Work for Ear17 C<DPletion ~e current project on b;yd.l'ologic regimen at the lOWer Colorado River basin and those constitutins the program at arid-zone research would be cOll1Pleted as now !3cheduled. Two additional projects would utilize the b;ydrologic information now available, both published and in the files at field offices; these two are: Regional water-resource aPJ;lratsal.-- An up-to-date appraisal at water resources in the region would identifY uncommitted stream supplies and undeveloped ground-water storage. Limited new recOllIlaissance data would be collected as necessary. A two-,.ear project; total cost, about $200,000. . Statistical s.naJ.ysis of st:t'eamflow records.-- ~e ultimate regulation and management of the l:'egion' II streams will be based on the observed frequenc.r of b;ydrologic events of various magnitudes. To that end, appropriate region-wide statistical ana~ses of streamflow records are proposed to be made over an initial period of two years. and to be updated at ten-year intervals thereafter. Machine c<DPutaticm techniques would be used. Cost Of two-year project, about $11!.5,ooo. Ground~water Sources . Potential-yield appraisalS. -- For certain ground-water basins in the region, which have been developed extensive17 and over IIl8.Il;Y' years, general dimensions and characteristics have been determined. Camnonly, however, information is lacking 011 amounts of water that could be with- drawn perennial17, and on volumes in storage that might be withdrawn ("mined") wi thin econanic lifts. Reasonably dependable values of either perennial or "one-tillle" yields of all such sources will becane in- creasingly 'necessary. It is proposed that appraisals of potential ground-water yields be accelerated several fold within five years, held at that high level over a second five-year period and then diminished ~rogressive17 as'proves to be appropriate. Estimated cost, first year "100,000, second to fifth year $250,000 per year. *AlI estimates in 1963 dollars. 7