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<br />I.~t" P"..rll', brolld UP'""" ..f fin. ...tr, pro>id.., un-Urnl uppunllnili.., rOt .....:tUIIOA.
<br />
<br />USGS Studies Trends in
<br />Slfeamflo,," and Uissoh,t"d
<br />Solids
<br />
<br />The major chanlZe~ In ~[reamno.... and
<br />di~~ol'ed ~Iid~ in the Upper Colorado
<br />Ri~('r Basin. during the JX'riod of re-cord,
<br />have been cau\cd by the construction of
<br />lake Po....eJl.
<br />Controlled Qullla...... and ml\lng of
<br />'it'asonalmno...., \lOrt:"d in the fe"enOlr
<br />have greally reduced [he seasonal and
<br />annual \'ariabilil~ in dl~o:harg(' and
<br />dJ'i'>Ohcd solid~ ,oncenlralion~ and load..
<br />In general. other lTends dt'tc':fed al
<br />slations art' of a Io.:al nature, and do nUl
<br />reflt:{;[ ba~in....id(' changes_
<br />!\lore detailed rlKull~ ""ill Oe aqiJable
<br />later in a USGS Open File Rl.'port lnol
<br />yet publi~h('dl.
<br />
<br />Reuse of Po\\{'rplanl
<br />Blov.down Waler for Irrigalion
<br />
<br />Re~('arch by Ulah State Uni\er~lI~
<br />~.:iemiM~ in eoopc'ration ....ith Utah Po....er
<br />
<br />and l.ight ~mce 1'l77 rC'latt'~ 10 the u~t' of
<br />....a~le....ater from the coal-firt'd po....er.
<br />plant al Hunllngton, Utah, fOf irrigation.
<br />Crop~ have been gro....n for R yean and
<br />~~)iJ ~alinity ha~ been monilored. Wa~te'
<br />....ater ....a~ applied b~ ~recialiled Im-
<br />g;ati(1n equIpment at rale~ rangmg from
<br />tho\e Ihal re~ulled in k.h'hing 10 ratc~
<br />that cau~ed no leaching.
<br />The ~aline "ater from the po....crplant
<br />I~ about 10 tJme~ ~altier Ihan the normal
<br />"(reek" irrigation ",Iter The bULld,up 01
<br />100al ~alh "'a~ ~ufficienl 10 cau~e mmor
<br />yield deprc~\ion~ in ~ome ca;.{'\ Tc~n
<br />made in 1911.5 ~ho'" tht' major dt'tnmcntal
<br />eoffeoct "'a~ boron to\icit~, ",hi<.:h i~ highly
<br />dependent upon tht' crop tYre.
<br />Thc forage crop~ te~ted ~ho....ed no
<br />.ield depre\~IOn due to the~t' boron ralC,
<br />but potato yic1d, "'ere decrea,ed to 10
<br />rercent of normal. The ~u~<.:cpllbilit~ of
<br />.:tOp~ "'a.. found to be (from high to 10'"
<br />'u~\~pllbllit~.1 polatOC'S, corn, baric),
<br />....heal, alfalfa, "healgra\\. A mOOc1 of
<br />",ater-boron-..::rop,irngallon,yield ha~ been
<br />Je\eloped and i, m Ihe pro..::e~, of bem~
<br />te;,ted agajn~t field dala
<br />
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<br />
<br />ISOlope Determines Waln
<br />. Sources, Research hy Ihe
<br />A~ricullural Research Sen'ice
<br />
<br />r\l~lLng methodology to determine
<br />,ouree, of return no", and ,alt loading
<br />rCqUlre~ pruhiblll\eJ~' llmc-con~uminll and
<br />e\pcn\l\.e 'tudle~ of "'iller and ..alt nu~e..
<br />on an off indi. idual rldd~ and deter,
<br />minallon of hydrologic gradient;, and
<br />no.... rale' An aJrernati\e mt'thodolog>
<br />with reJatl.d)' 10" "::O~l;, in\olH's U'>C of
<br />..Iabk i~010pe<; and the ..::hemkal
<br />..'nmposltlom oT surfa..::e and ground
<br />"3ter~,
<br />In the (iralld Valley, Ihe i~otopic
<br />dirTclen..::e\ !:>et"een local ground "3ler
<br />(a.. mea\ured in Ihe upland area" and lhe
<br />Colorado RI\er waler u,ed for irrigation
<br />are \ufr"Klently large to enable e~llmaring
<br />th~' relali\e L-onlribulion;, from the;,e llloO
<br />SUUr..::C\ Water ~ample.. "ere la~en in Ihe
<br />"lftter from all the "a\ht'\ in the' Grand
<br />\'alky
<br />Since there "ere no irrigalLun no",,, nor
<br />\Urfa..::e no"~ Irom upland area.., the ba.c
<br />nu" 1ft Ih~' "'a\he~ ~hould reprc\ent Ihe
<br />..::ompo\l1ion of the ground ""ter recharge
<br />into the Colorado Rivcr. The i~OlOpic
<br />compo'llion of the ba~e llow~ "'3\ \'cry
<br />uniform, indicaLin,!! thaI aprroximalel~ M~
<br />percent of the ha\c flo"', arc from
<br />irrigalion and onl~ ] 5 per..::cnt horn non-
<br />Irrigated \our..'e~.
<br />:lonaly", 01 "ell ....ater' Iftdi..::ated that
<br />the ~alr contribUlion in ba'>C now~ due to
<br />IITlgalion is le..~ Ihan the wntribulLon of
<br />the irrigation non-component to 101011
<br />ba,e no" volume, The contribution of
<br />on farm dcep rcrcolation ..::ould not be
<br />accuralel) ~eparated from canal and
<br />lateral seepage bJ\t'd on ,table I,OIOIX'
<br />and \~l]ulion compo\Llion.
<br />
<br />I>irll [)t'\'il FO:\"51 ApproHd
<br />
<br />Thc En\ iron mental A"e~~menl and
<br />f'O"iSI lFindmg of So Signifkant
<br />Impact) on the Dirt) De.il Rl\.et UnJl,
<br />lilah, ....a~ appro\et1 on July. 24, by' the
<br />Regional Dirl"l:tor after re.ie" by other
<br />IftterestC'd agencie;,. It "'3\ releal.ed 10 the
<br />publi..:: on Augu..l 8, [9,%.
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