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00228a . RecOJl11aissance appraisals. -- Reconnaissance appraisals are proposed tor those ground-water basins that have not been developed or investigated, to estimate or determine extent and properties or the aquifers and chemical qual:l.ty of the water, to define sources of recharge, and to estimate storage capability and yield. Same such . basins doubtless contain water of good quality and appreciable quantity. Other basins are known to, or~, contain brackish water that would be unusable unless diluted. To take full advantage of new develop- ments in the technology of desalinatiQ:l, the brackish-water bodies would be delineated so far as is feasible. !!he reconnaissance appraisals must be based on extensive knowledge of the areal geology; read1~ available bydrolog:l.c information, would be gathered also. !!hey are proposed to be large~ completed within ten years. Esti- mated cost, first year $100,000, second to fifth year $250,000 per year. Managed storage.-- In certain ground-water reservoil('s, ,storage space can be evecuated by withdrawing water seasona1~ or during a succession of drought years, and then refilled from surplus strea:mf'lOll' either natural~ or artificially. Unde:i' favorable circ1llllstances, it should be practical to manage underground storage so that perennial water yield would be increased. OVers:l.Dq>l:I.fied, this is a principal method by which surface- and' ground-water sources ~ be Ill&Il8.ged jOint4', Determining potentials for such Ill&Il8.gement would be an integral part of the potential..,.ieldand reconnaissance appraisals lIescribed above. Major opportunities for Ill&Il8.ged underground storage appear to e:li:ist beneath the valley plain along the main stem of the Colorado River. In particular, a terminal-storage facility of this kind in the vicinity of Yuma, with Ill&Il8.geable storage capacity of 500,000 to 1,000,000 acre-feet, ~ prove feasible and practical. Appraisal of the physical and bydrolog:i.c features related to this potential is one objective of the Lower Colorado River investigation currently under ws.y. SUrface-Water Sources . Gag:l.ng-station network.-- OVer most of the Pacific Southwest, the network of pr:llllary gag:l.ng stations on principal streams is reasonably adequate. Ultimate~, however, a moderate number of roving, secondary stations wi:).l be useful to: (1) discriminate uncommitted supplies that ~ prove to be developable in the Little COlorado and Bill Willi8ills river basins and elsewhere at scattered places; and (2) determ1ne ma.gn1 tude and frequency of ephemeral discharge into numerous desert basins, discharge which is a prinCipal source of ground-water recharge. It is proposed that, in each year of an initial five-year period, 50 secondary stations be established; also that each year thereafter, 50 such stations be relocated to new sites. cost, first year $50,000, second to fifth year $140,000 per year. 8