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I I I I I I I I I I I I I I I I I I I (".' ~ J.: l:' I !, .:; i:"., . ~ ".' ~..1 --!.: The final selections for detailed study were combinations of the intra- state routes across Oklahoma and northern Texas with sources from the Arkansas, White and Ouachita Rivers in western Arkansas and the Red, Sulphur and Sabine Rivers in northeast Texas. Results of those investigations are also summarized in Chapter Four. CORPS INTERSTATE TRANSFER STUDIES The Corps of Engineers' participation in the High Plains-Ogallala Aquifer Study was mandated by Section 193 of the 1976 Water Resources Development Act (P.L. 94-587). That participation was later defined and detailed in meetings with the U.S. Department of Commerce and the High Plains Study Council in 1977. The following responsibilities were accepted by the Corps as a result of those meetings: o To report to the Department of Commerce on the engi neeri ng feasi- bil ity of water transfers into the High Plains Region from adjacent areas. Those feasibility studies were to include preliminary cost est i mates for each alternati ve interstate, interbas i n water transfer option selected for detailed investigation; o To review previous water transfer studies and reports relevant to the High Plains Region; identify the most feasible alternatives; conduct necessary hydrol ogi c and hydraul i c studi es; and prepare appropri ate engineering design and cost estimates for required facilities; o To make necessary envi ronmental assessments of the sel ected alter- native interstate water transfer options and facilities. Only those environmental considerations associated with the construction of canals, reservoirs and other required facilities, and the physical effects along each alternative route were to be investigated; and 7