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<br />PlumbIng <br />the West <br /> <br />"~E HAVE in the Colorado <br />an American Nile an-ait- <br />in!:: r('~ulalion." said Los <br />Angeles water investigator <br />Joseph B. Lippincott in 19 J 2. <br />Since that time the river has <br />bttn "regulated" almost oul of <br />existence and now rarely emp- <br />ties into the Gulf of California. <br />With scores of reservoirs and <br />diversion dams, hundreds of <br />miles of aqueducts and tunnels, <br />dozens of pumping Slations, <br />thousands of miles of canals. <br />and more than 30 hydroelectric <br />plant!. the river basin contains <br />one of the world's most con- <br />trolled river systems. <br />Riverwide regulation began <br />with the 1922 Colorado River <br />Compact, which divided seven <br />western slates jnto upper and <br />lower basins (map) and allo- <br />cated 7.S million Bcre-feet of <br />,,'ater a year to each. A 1944 <br />treaty with Mexico guaranteed <br />that country 1.5 million acre~ <br />(eel annually. Although the Col- <br />orado was committed to deli\'er <br />16.5 million acre-feet, its annual <br />fiow has averaged only 14 mil- <br />lion since 1930, and evaporation <br />from reservoirs removes another <br />2 million. <br />As long as some states con- <br />tinue to use less than their share <br />(inset), others can siphon off <br />more. But as populations rise <br />and states in both basins com- <br />pltte waler project!, the Colora- <br />do will be virtually lapped ouL <br /> <br /> <br /> <br />- <br /> <br />. I <br />I -. - I <br />I' . .:'l" -, -: '., <br />jL: ~,'UHITHl ITl'lT~' <br />J ,..,.....- <br />\h'/ .... I ',-" <br /> <br />~~~'\- <br /> <br />..... <br /> <br />(0<( ~ILLlON ACRE-FEET ....,. 0 "1 .. 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Mor.t.....24Inchn <br />thfU.Spot.bl...tlrlt.ndud < \,1' '" .J\'fi___'Io<ll_ I. j ....O(.~",....t1on. ~ annu.Jpndpltltion <br />of!500pP'" Thlqualltyoft'" , .,1 t{ ~wo;;" . - / ~ ., 1- . <br />....tu....chlngM..,<corrocntbe \ \ ' ~ r" :-. ! J)' , It IJ ~ ,~ ~ ~(,...:v~ ~ ,"",lt141uwd <br />wlthlnII! FPmofthat'ouNht . \ c;, -~!: \ ~ X.,; /1' I ~ A. ~ rq 0_ <br />.r1.Jo..",. \. l.~1;' J" ',. . .' ~,. Lo- <br />\'/ 'J" ; ~ I t' 'Jll-.," .~. .~1r.., _ '" If, c....w......... <br />.,'" l..{ I I,I (), ",'__ \. I _ .1f <br />NATIONAL GEXJGRAPHIC \~.. ."t'" .: ) '. J : j\~<': r / c;] N..........."._... <br />'. . ". I . r.'" 'J tlt ~ IN <br />Pages l6-17, June 91 'l, ...{) r'" "::":'''r.;;;. .. -t I .. .......- <br />\,. ~(.'~. . "r.: INfltl 0 o....rondMnplw <br />4t '- '"." .; 'I 1~ (' 0 <br />~ ) :~ I;... I! ThlCoIoracioRMr k*'dralnl <br />....r ,. (.f,;'~~ 1'./ t.. :-' a_.u.,lIml..rtdl"lflootof <br />I ....,~::-.;. I ... 24...ooo...r.".....-_- <br />C' q)..~.... twelfthtJ.....fthl <br />o ,,/'" ___u.s. <br />......,.. .........- <br />'. <br />" r-.. <br /> <br />WATER IN. <br />WATER OUT <br />1990 <br /> <br />-I<~" <br />.C'C',.'~D", <br />'ol"b. <br /> <br />C''''{/,ot:: <br />,~ <br />"'.:~I '\>/1' <br />'. <br /> <br />, <br /> <br />~:~"'''rll <br />... ~.,-" <br />-..,;., .. <br />"" ..... <br />'" "'~ <br /> <br />.c,~.~ <br />,'1"/C . <br />('~O <br />, <br /> <br />. <br />, <br />. <br /> <br />-.. <br />'. . . <br /> <br />" <br /> <br />-- <br /> <br />_cu___ <br />.1\,,,u,..____'1 <br /> <br />-..... <br /> <br />../" <br />1 ~. <br />