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[Vol. '9: Page 1 e at Lee Ferry. That ~e southeastern por. 1 Juan and its tribu_ =s onl y 1.29 per cent Dortion of the basin , o system water and tah is both a carrier t the Gunnison join Ie northern portion discharge. The por, 'Or but 0.96 per cent bined with the in. 'r full development, I states. Each of the )stantial advantage ributions to be the 'ser but a small con, :he unappropriated Dletion as projected , basis.''' Utah did propose an appor- :ion of any method ,Ie to all four states. 'do Rit/~r, proposed as a basis for nego. ions totaling some ects were built and :. This amount of ld the report con- :fits, and potential he only source of water lLaRADO RIVER J 40. depletion was projectro San Juan was proi~ted feet to !.he N~ Me'llito 40. It ~em5 lhar takillg ivisjon of the CODSump- IS afr.Ud more populous U:COJlD, Me<!:ting NO.3. '2$ projected at 967,000 I J29-3:1 (.stafdDent 01 THE STAl"UI OF INVEJoo THE COLORADO RiVER '9 I"o,,=bu 1966J "._] . the negotiations, the Compact Commission dropped the idea LOU y Ul. . d I I 10' A of f lacing and uSUlg a master economIC eve opment pan. n en- . o~u advisory committee was established to provide water resource l:'Il~r1/lg "'d . f' th d f 'd the commiSSIOn s COnsl eratlOn 0 varIous me 0 s 0 appor- .bt:l to al C ,. d'd d . th . t ". In time, the Compact ommlSSlOn eCI e to apporlJon e Donmen . b . f' f n a Percentage basis rather than on the aSls 0 maoumum acre- oot ",ater 0 ., d ch . f th &l I tion allowances.'o, Th,s solulJon was favore by the aIrman 0 e ep. e cering advisory committee because the variable yearly /low of the river cngm . th b II' '0' made it difficult to appor?on e w~te~ . ~ mass a ocatlOn. The Compact Comnussion, whlle lflltlally unable to agree on the per- centa!:e allocations for each state, did al?rc:e. on the relevant factors to be nsidered in arriving at the percentage d,VISIOn. Colorado delayed the final 7tcrmination of percentages until the engineering committee reported on t1~e production of water by individual states.''' Wyoming and New Mexico then "forced" Colorado to recognize that present and future consumptive I 'd' 10. uses were also re evant consl eralJons. Once it was agreed to divide the stream on percentages, even though the figures themselves were not agreed on, it became necessary to determine a uniform method of measuring water supply and use. The length of the ri,"er system and the aridity of the terrain make water losses critical but dif- ficult dements to measure. The negotiators accepted an engineering report that gave figures for historic state-line /low, out-of-state losses, and historic contributions at Lee Ferry and provided a meulOd for measuring channel )"',"5. Comparisons of virgin /lows between two points were used to calcu- bte evaporation and transpiration losses.'o, To calculate depletion at state lines, the engineering committee reconstructed the virgin /low and sub- tracted man-made depletions. A credit was given for salvaged channel losses by deducting them from man-made depletion values before the buer were deducted from virgin /low.'" This calculation expressed as a formula is: depletion at state line = virgin flow - man-made depletion + salvage. nl....nONs At.1Tlf,oJu2.U1 To BE MAnE Ill' TH.J: BOl1LDER. CA"'-YON PROJE.CT ACT AND THE BOULDER C&"'YO~ PROJECT AD,USTMENT ACT 57-s8 (19.0) (comments of the seven Colorado River Basin aLalr'S in response fO Th~ Cohmuio Rill~"). J03. J RECORD, Mec=ting No. I, at 044. 10<1. Ibid. 105. lid., Meeting No. ".at]. 106. Ibid. The commissiOD apparenrly did Dot coDsida the feasibility of a mass a.lLocatioD in 1I;llf of the ston.ge unit!. proposed to be constructed. 107. lid., Mc!'ting NO.4. at n. The chairman of the engineering comminee considered the rcpon of historic sUle-line contributions essential lC a p~cent.age allocation. J id" Mec=ting No. ... at 10. 108. I ;d., Meeting No. <4. at 11-12. The c=ngim:uing committee also rttognizoi that pot~tul Won "constitute important factor5 . . . aDd arc considered to be involved up 10 the 7,500,000 acre fr'C't . . . allOCllled . . . ." J iJ., Met=ting NO.4. at TO. log. SU:I id., Meeting No.7. at 43. 1JO. Su, ~.I., 2 id., Meeting No.6, at 59 (remarks of Mr. BreiteQstein of Colorado).