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. . . ~~. ~ G"j ~... Chaptor V.--Future project expansion Un~llocated water in the Colorado River Basin is belioved to be of sufficiont quantity to pormit expansion of the Initial Development into II llaximUlll Grc,vity Divorsion, provided the water wore mllde availaule for diversion to the E~stern Slope by Uppor Stlltes Compact agrooment. Fur- ther investications would be roquirod to accuratoly detormine the amount of unallocated Westorn Slopl wator divortible, tho most eeonomio route for divorsion to the Eastorn Slopo, ~nd tho mnount of hydroelectrio po'~r that could bo gonorated. Only II goneral do scription of tho expan- sion including computations basod on existing rough estimatos to indi- cato the rospoctive bonofit-cost rlltios is included heroin. MAXIMUM GRAVITY DIVERSION , ill addition to tho Initial Dovolopmont this diversion would con- sist ef the llddition of 595,000 acro-feot of ~ravity flows from the uppor Gunnison, ROllring Fork, ~nd North Fork of the Gunnison Rivers. Proliminllry invostiglltions of tho .~tor supply have boen mado, but tho probloms are being furthor studiod to refine the dc.ta and fissure that no potontilll uso of w~tors on tho '''.estorn Slope will bo ovurlookod. It is anticiplltod that dllta obtainod from tho rostudy will not ~te- rilllly docroase the diversion of firm flmvs, llnd that tho allocation of .~tor to Colorado by the potential U~por Statos Compact agreoment will uo tho govorning fllctor in the final ~d totlll llmount of diversion. In llny event more caroful investiglltion llnd oxploration should docre~se rather than incre~se tho ostir.lc,ted unit cost of diversion. Tho 595,000 acre-foet of additional water addod to tho 60,000 acro- foot divortod in tho Initial Dovolopmont would bring tho total tral:s- bllsin wator to 655,000 acro-foot. This amount of additional dopondllblo wlltor in the Arkm1s~s Valloy would fully satisf'1 the supplemontlll de- ~nd for irrigation vlltor and make possiblo the irrig~tion of 225,000 acros of now land. About 45,000 acro-foet of municipal ,vater could bo furnishod to Colorlldo Springs, Puoblo and tho Arkanslls Valloy tm'lllS in addition to thoir prosont supplios. Tho total powor which could bo gonorlltod would amount to 2,200 million kilmvatthours pur YOllr, tharo- by providing" basis for .f'urthor industri~l oxpansion within tho projoct aroa and incl'oa~:"g the offoct of projo ct devoloIlllont on tho genor~l e conomo' of the Nation. as