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<br />.~ """!' ('.: :) <br />11.;,- <br /> <br />portion of Mexico's Colorado River water allotted by the Vater Treaty of <br />1944. J'llinute i'Jo. 240 provides that Mexico inay request deliveries of a <br />;n~i:;nLLI of 20,600 acre-fGet a year. <br /> <br />Table 5 presents, for calendar year 1977, a sllii~ary of scheduled <br />orders of Hater fro,;] the Colorado River below Parl,er Da:.1, the quantity <br />not tal,en, and uhat happenC:Hl to the rejected Hater by agencies. The <br />California agencies ordered but did not ta!,e 2.6 percent of their total <br />orders, and the Arizona agencies did not take j.4 ~ercent of their total <br />orders. This resulted in 260,514 acre-feet being ordered but not tal,en. <br />ar this a,',lOunt, 54,92l~ acre-feet l'laS charGed to United States' users not <br />taking Hater ordered on the I,laster Schedule allCl lJaS delivered to I'lexico <br />in excess of the requirei.Jents of the Mexican \later Treaty. All additional <br />17,16~ acre-feet is chargeable to operational control of thG River and <br />in overdeliverin!; a s:nall ai,lOUllt each mOllth .to ;,mlce sure Bexico received <br />its total order. <br /> <br />Coordinated ODeration of <br />Colorado River Reservoirs <br /> <br />The Bureau of Recla.aotion released its seventh annual report on <br />the operation of Colorado River reservoirs pursuant to Section-602(b) <br />of P. L. 90-537. The report described the actual operation of the <br />reservoir durillg v;ater year 1977 and the projected operation for \rater <br />year 1973. This report repeats the findings of the six previous annual <br />reports that "the accUliJulotion of '602(a) storage' is not the criterion <br />governillg the release of \!ater during the current year." Based on that <br />findin~, no deter;'.lination was made of a lllLaerical value for 602(0.) storage, <br />and 1973 Hater year releases fro;;l Lake POHell \Jere estimated to be about <br />1,2JO,OOO acre-feet (assuninG average couc\itions). Under this "i'ainimum" <br />release of 3,230,000 a.f., and assILnillg average runoff conditiollS, active <br />storaGe in Lab~ Powell is projected to be about 2.9 ;;Jillion acre-feet <br />less than in Lake Mead on Septeinber 30, 197J. <br /> <br />Power <br /> <br />The production of hydroelectric pouer in Colorado River Basin <br />power plants constitutes a vital resource to the Basin states, both for <br />the energy generated and for the pO~Jer revenues received. Tables 6, 7, <br />and :1 ShOH l~ey aspects of hydroelectric potter [';eneration in 1977. <br /> <br />Operating levels and characteristics of the major reservoirs at <br />beginninG al'cl end of the \later year are shoun in Table 6. All reservoirs <br />except Blue l\!lesa stayed above rated head elevation thrOUGhout the <br />Hater year. Statistics on operating year ~Iater releases fro,>] Hoover <br />Da,;l alld electric generation are sho\Ul in Table 7. Geueration at Hoover <br />DaD during the 1976-77 operatiug year Has 1 percent below the previous <br />opcratin!; year. <br /> <br />- 6 - <br />