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<br />ON-FARM SYSTEM IMPROVEMEl'ifS FOR 1112 FOUR ALTERNATIVES
<br />
<br /> ALTtR.>:ATlvt OllY. ALTEM,I\ATIY[ 1\10 "'LT[R~ATIYt TURU ALTER.>:ATlYl!rOtl
<br />IT'" L':itT tsn,'UTlO O:iETlItt [STU1,ITlJ) O~E TIME f.5TlKhTlO O~.!: TIX!: ESTI:v.UD OI;ETIHE
<br /> QL:A.,.tTY 1WS;~;"Tl(>>1 QUMTlTl' 1M,STAI.LAtIO. QUAHTl:'T lItSTAl.UnOW Ql.:.....Tln 1:olSTALUnOW
<br /> COST ,,'" COST
<br />Ditch Ullln, ... J,600,Ooo ",000,000 J,120,OOO ",800,000 2,880,000 11,200,000 J,180,OOO u.no,OOO
<br />1I1tchSuuUurn '.. 4,)00 78',000 2.000 no, coo 1,'00 J)],OOO 2,1>00 "",000
<br />'l,.hllll
<br /><10" ~11..Itt!r ... . 0 112,000 22",000 112,000 22'.000 14,000 1108,000
<br />10000-U" (.I_Uer ... - . 140.000 )60,000 140,000 )60,000 10),000 410,000
<br />>U" db..ur ... . 0 20,000 UlO,OOO )l,OOO 219,000 11,600 U9,OOO
<br />Str...:t\lu. ... . - '00 n,ooo '00 ",000 '00 n,ooo
<br />YIMII L...rllf1,1
<br /><'00,d1/..: ... - . 9,)00 998,000 '.'" 94S,OOO ',900 119,000
<br />'00-800 'd~/.e, ... 0 . n,ooo Z,722,OOO 20,200 2,661,000 1S,lOO 2,0",000
<br />>'00,d1/.c. ... 2,0.. 4111,000 2.2011 441.000 1.100 J4S,OOO 2,100 422,000
<br />'ull..,rhu OUI" ... 0 0 'Z7.OOO 2,J72,ooo '27.000 2.)11,000 )",000 1.111,000
<br />".'.",rlll. n."lc.. ... 1,100 UO.GOO 1,100 210,000 1,100 220,000 1,100 208,000
<br />Drl,lrr!IU!oll ... 0 0 - 0 1,600 1,4'0,000 ... 160,000
<br />',rhIUer Irrf.ct,!" ... 0 . - - Z,4OO I,UO,OOO ... '110,000
<br />S",lltotdor eo.t 10,453,000 n.".,ooo 19,31],000 1),)11.000
<br />20Z CoIIUII,_, 2,14',000 3,201,000 , ),"'.000 ),129,000
<br />totd hUdlcU"" coat 12.600.000 19,100.000 U,2OO,OOO II.JOO,ODD
<br />
<br />ALTERNATIVES
<br />
<br />IMPLEMENTATION
<br />
<br />The primary objective is to reduce
<br />the salt pickup from the valley by
<br />improving irrigation- efficiency and
<br />improving watershed conditions.
<br />Seepage losses from unlined ditches
<br />and deep percolation from field
<br />irrigation were considered to be the
<br />major sources of pollution. Four
<br />alternatives shown in the table were
<br />developed for consideration by the
<br />sponsors. Alternative one considered
<br />an improvement in irrigation manage-
<br />ment by changing the time of set and
<br />aome system improvements; the second
<br />considered more extensive improve-
<br />ments 1n existing systems and manage-
<br />ment of the time of set and flow rates;
<br />the third, the same as alternative 2,
<br />considered changing 5,000 acres to
<br />drip or sprinkler methods of irriga-
<br />tion and management practices includ-
<br />ing cut-back flow rates; and the fourth
<br />program alternative level of on-farm
<br />irri~8tion improvement is a combination
<br />of the other alternatives.
<br />
<br />The implementation program needed in
<br />Grand Valley to significantly reduce
<br />aalt loading 1n the river requires
<br />acceleration of on-going USDA programs
<br />and the cooperative effort of federal.
<br />state and local agencies. and private
<br />organizations. Four actions have been
<br />identified as being essential to a
<br />successful implementation program.
<br />These are:
<br />
<br />1. A level of federal funding that
<br />provides incentive for voluntary
<br />and accelerated participation by
<br />farm operators.
<br />
<br />2. A detailed conservation plan for
<br />each farm,
<br />
<br />3. A larger staff in the SCS Field
<br />Office in Grand Junction to service
<br />the accelerated work load.
<br />
<br />4. A commitment by each farmer to im-
<br />prove his irrigation system.
<br />
<br />00.2'61
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<br />
<br />,GrOlld VaJley
<br />
<br />COLORADO
<br />
<br />ON-FARM SALINITY CONTROL
<br />FOR
<br />THE GRAND VALLEY
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<br />DENVER. CO.
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