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<br />THE 40 YEAR WATER-USE REVOLUTION <br /> <br />A NEW TECHNOLOGY <br /> <br />7,000 <br /> <br />_'0'allo,8....n <br />"'""""-iI.Main St~m..IPl,;,"" <br /> <br /> <br />Efficient irrigation pumps, <br />goted pipe, concrete ditches, <br />sprinklers, infra-red photog- <br />raphy and other new develop- <br />ments are now on integral <br />port of the irrigation system. <br /> <br />8,000 NUMBER OF IRRIGATION WELLS' <br /> <br />South Plolle Basin <br /> <br />6,000 <br /> <br />5,000 <br /> <br />4,000 <br /> <br />- <br /> <br />3,000 <br /> <br />/' <br />-~ <br /> <br />Engineering studies show the <br />available supply to be near- <br />ly doubled for the critical <br />growth periods. <br /> <br />2,000 <br /> <br />c <br /> <br />1,000 <br /> <br />.... <br />Before 1930 1930-39 <br /> <br />1940-49 <br /> <br />1950-59 <br /> <br />1960-69 <br /> <br />Water tables hove been con- <br />sistently restored after the ir- <br />rigating season. <br /> <br />s.ov"'" lo!ot Bm," I~fo,,,,o"on <br />Mo,n S'..m In;OIrT'Ohan <br />,,11M.."..' <br /> <br />Cola.odoS'o...h<.l,n.,..., <br />US G<'Olo';l'col sv,,"~ a"pl <br /> <br />. <br />. <br />~ <br />. <br />. <br />U <br /><( <br /> <br />T OTAl WAT ER r- <br />DIVERSIONS r- <br />So vlh PicHe Bo..in ... '- - <br />Su dace Water. r- - <br />G round Waler [] '- <br /> i- i- <br /> - r- <br /> - <br /> - <br /> - <br /> = '- <br /> I- <br /> \= -, - - --- - <br /> I- <br /> - <br /> <br />1200 <br /> <br />1000 <br /> <br />- <br />o <br /> <br />800 <br /> <br />. <br />." <br />C <br />C <br />. <br />, <br />o <br />'" <br />~ <br />C <br /> <br />600 <br /> <br />. <br />C <br />o <br />';; <br />. <br />. <br />> <br />o <br /> <br />400 <br /> <br />200 <br /> <br />1940 <br /> <br />1945 <br /> <br />1950 <br /> <br />1955 <br /> <br />1960 <br /> <br />1965 <br /> <br />1970 <br /> <br />$c "a u.s G~olo':pcol Sy,v~. D<-po'tm~M 0+ I~'~"o, <br /> <br />P"9~ b <br />