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<br />.' <br /> <br />, <br /> <br />. . <br /> <br />.. <br /> <br />" <br /> <br />.' <br /> <br />...... <br /> <br />.. I.;.... <br /> <br />~" <br />~ <br />..~ <br />~l <br /> <br />iniga tion the efficieacie5 \~el'e Jotermineu in ~ome cases.' Several <br />~ <br />of these COI:lput"u efficiencies are l:rcater than tho~o determineu <br /> <br />,~}~~~ <br /> <br />..;,..:..... <br /> <br />... <br /> <br />in the 1964-196& Use-of-Water Study. <br /> <br />.?:.;:'.~.: <br /> <br />v':". <br /> <br />......-:..: <br />.r...... . <br />..,..... . <br /> <br />Nithout an isolated study area or aueCjuato Hater mea~urelO1ent uevice~ <br /> <br />neither the overall irr;iGation efficiencies or tho effects on salinity <br /> <br />,;..'.'- <br />",:~ ;.~ <br /> <br />in the' Colorado Rivel" can be determined at this timo. The benefits <br />3{ 3/0 ';0, "'0 () <br />in the 10ll'er Colorado Rivel' Basin arc estimated to be $~g~ <br /> <br />:.,:... <br /> <br />:'!........ <br /> <br />'-:,_,.:...: <br /> <br />annu:J.lly for the Irrigation HanaGementServiees anu System.; Improve- <br /> <br />\ ".,". -:" <br /> <br /> <br />~ <br />:::~~H}~ <br />:~:.:~:.:.:/.., <br /> <br />Programs. <br /> <br />Environmental Coasideration <br /> <br />;};\~~? <br />. ':~.:-"':: <br />. ." '.'-~:':- <br />. .-:..' .~.~ <br /> <br />:.:~.: ..::.~ . <br /> <br />In'ip,3tion scheduling in. the Grand Valley \~o\lld not involvo con- <br /> <br />.'\~;-,;~.-; , <br />~j~ )E.~ ~:'. <br />:. ...:.. ;~~., <br /> <br />struc.i:ion activities that l~oulu affect the environment, but the <br /> <br />,":,,~::'::' <br /> <br />. .~. ,"' <br /> <br />operation of the llrogr:lm shoulu have siGnificant effects. <br /> <br />.,:.::'\.~ <br />"-'..-' <br /> <br />...... ".;. -~' <br /> <br />...." "," <br /> <br />....... <br />....,. <br /> <br />..:....... <br /> <br />By increasinG the .efficicncy of irriGation, addition:ll water \~ould <br /> <br />>\;=:~..) <br />~~~~~{~~: <br />~:}::~'.,~: <br />t~~b~ <br /> <br />'t;~"":~:':" <br /> <br />be made available for ot~l~r uses, . salinity concentrations of the <br /> <br />ColO1":1do River \\'ould be reduced, and crop yields would be increased. <br /> <br />The ir"provcd water qualit:r h'ould be a 10nG-telom bencH t to down- <br />, <br /> <br />,.... . <br />\\"':.;.:.. <br /> <br />~~,):~~.:. <br /> <br />. ;. '-~. <br />).......~~::~.:: <br />.. <br /> <br />stream industrial, munici)al. and ar,ricultural uses. Erosion along <br /> <br />dr:J.ins and \~2.shos liQuld be expected to decrease under irrig"tion <br /> <br />scheduling because of the. reduced l"etur:1 flO\~s. This \~ould conserve <br /> <br /> <br />soil and reduce siltation in the Color;\do River. <br /> <br />:",- ~'. <br /> <br />1II-31. <br /> <br />'. <br /> <br />., <br /> <br />}". <br />~.~:.... . . - <br />- <br /> <br />;':'>.;:;~:~";~f;;:,~:;f:\:''i:::..;,::.-..:'::..\~;:}:i:;'::{{,;'>;,~.. .~..<->!::'C>~~-';:~G;::t~:.~.i~~<:.:;~>:::;; /~~;:'.':;:,;.';:~:':: ~!(/';}~, :";"~;X~.:~~.;i.:':;~~2;;.}:,_:;;~ . <br /> <br />.~,. .,' ~. . <br />