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<br />largo Inaea.~e in predpltatlon (20%), one would see roughly a 20 percent increase
<br />in mean annual runoff, a 30 to 60 percent increase in storage and a 40 percent
<br />Increase in power prodUC1lo!l, 'I
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<br />"Normally, Lake Powellllcver rails below the level needed to generate hydroelectrlciry. If
<br />average runoff dec:reases by only 5 percent, hydroelectric generation at Glen Canyon Darrj
<br />wJ/1 stop 20 percent of the time. If average runoff drops by 20 percent, then hydroelectricity
<br />generation drops 60 percent. These drops would haye dramatic effects across the
<br />Southwest," accordlllg to Peter Glelck. \
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<br />Dellverle. ot Water to the Central ANolle Project (CAP) :
<br />, Under current condItions annual deliveries of water to the Central Arizona Projectl
<br />(CAP) are expected to equal or exceed sched1,lled dellvenos 60 percent of the time, whllel
<br />dellver!es ran to their minimum level 20 percent of the tlme, Normally, deliveries to CAP;
<br />never fall below the minimum of 451 thousand acre.Ceet per year, which Is the level ati
<br />which mun!cfpal and indu.~trilll usage would be Impaired. Even s\iSht dccreiAes.ln runoff,1
<br />llowever, have a major impact on CAP wllter, 4ellveries, , A permanent reduction inl
<br />Colorado Rivet average Nno!f of only 5 percent wOlJld cause the frequency of delivcricsl
<br />to CAP to fall sub$tantlally, so that full supplies are only delivered in 35 percent of the,
<br />years. Moreover, under thi5 scenario, eM receives only the D'llnlmu(l1 delivery SO percentl,
<br />of the years. '
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<br />Dellverle. or Water to Mexico '. I
<br />Under current conditions, Mexico recelyes ISIS thousand acre.feet per }'ear. . tfI
<br />average annual runoff drops 10 percent, the alloclltlon "lodel delivers to Mexico Jess than
<br />their full treary amount In 5 percent of the years; under the .20 percent runoff scenario,
<br />Mexico experiences Colorado Alver shortages 35 percent of the time, Although the delivery
<br />data suggest that Mexico Is affected only in extreme cases, decreased flows In the lower,
<br />badn will lead to poor quallry of water delivered to Mexico almost all the time. In (act, i
<br />Il.lllower basin users would suffer a significant detline in water quallt)'. I
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<br />For 1"'e copies olllle full "POIT, please COlllacl the U.S. E1r\lircmmenfa! Prolect{Oll Agcl1C)l
<br />publica/tofU dlstrlburwll: Orders can hI! Ja:ced 10 (51J) 891.668$. Pholle otdm go to ($13)
<br />891.6561, TluJ TtJp0l1111le is: 'The Colorado River Bas(11 and Climatic Change.. The rep011
<br />number J.s EPA (;2JO.R.93.009.
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