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<br />
<br />"
<br />
<br />.
<br />
<br />13Gl
<br />
<br />-3-
<br />
<br />estimated. Pr~vided,
<br />sindlarly estimated,
<br />
<br />however, that co~p~r~ble r~ducticns for
<br />the whole process ai11 ba consistent.
<br />
<br />future rro~ects nre
<br />
<br />The projects listed in the Color..rjo B.'lsin report quite na.turQl1y divide the~-
<br />selv~s into sev~r'l1 classes. Increased use by rro.iects Already built and USi! by
<br />pro:~ct5 building O~ 3uthorized are in ~ cetegory superior in opportunity to
<br />even those projects th~t complete the initi~l list proposed. All the foregoing
<br />projects are, however, in :t more f~vorable ebss thAn the rest of the pl.o.1ects
<br />listed in t~c b~sln report. For the purposes of this study projects built, build-
<br />ing or ~uthorized and thOse in th~ initial list arc assumed to suffer n reduction
<br />in use, during the minimum decnde in the r~tio of only one-fourth of the decrease
<br />in str~am flo~. Since the purpose of building th~se projects which ~re ~ll for
<br />supplct'lental wr\ter, is primarily to :'eet the h:J.ndicaps of the minimlL'n dec:lde,
<br />this reduction is believed to be rtdecuate and ," reco gnition of th€' int~ntion of
<br />the projects theoselves, for most of them h~ve had quite complete study.
<br />
<br />.
<br />
<br />Frojects not on the initial list no~ in superior c~tegories, ~nd pasture ir-
<br />rig~tion, ~ll of which involve much new l~nd, c~n hardly expect to provide at ~n
<br />allowable cost, stor~ge f~cilities L~3t will prevent great reductions of use in
<br />dry ~r~ods. These, therefore, have been reduced for the dry dec~de in n ratio of
<br />one-hnlf the decr~aSe in stre~ flo~. Reduction in the ev~porntion loss of middle
<br />river stor.'l"'n would come !!.boc.t as thClt stor3ge, full ;'l.t the b<1ginning of such a
<br />period, '".'1$ progressively d~ssipated to supply the water tlr:at must. be delivered
<br />at Leo Ferry. Thi.s loss, tharefore, h'lS also b(,en reduced in the r"l.tio of onp._
<br />half th., reducticn in st:'tJ'\m flow during the dry deoc:Jde.
<br />
<br />In view of the foregoin#! assumrtions '\s to upp~r river conditions, the data
<br />available result in av~rage ann~11 stream flows 3nd depletions for both the long-
<br />time C!nd dr:.' periods, shown i:1 t..'1c follo"nn'! t."lbuJ1.tion:
<br />
<br />','Jyomi ng
<br />Utoh
<br />Color~do
<br />New 6~cxi co
<br />Ar~zoM
<br />AT OR AEC\'~
<br />1 EE FE!l.~Y
<br />
<br />UF'PF'..R CCI.ORADO RIVY.ll
<br />STRS,U'("FTIfu' !~ F RESE?~_)~EPIETIOUS
<br />
<br />STRSAM FI OW ~ PRESF.JIT DEPLr7IONS
<br />1q]4-1"4)~J-1940 14-43 1~14-1943 J931-1940 {\i'1
<br />1,483,620 1,111,610 74. 'I J74,:xJO 329,r50'" 0
<br />1,743,320 1,052~720 60.1. 515,900 416,410~i.~~
<br />10,2E2,350 7,E3O,910 76.2 J,339,30O 1,J99,39O.1 <~
<br />247,530 109,900 44.4 63,400 46,050 ,~".,..
<br />'L7->2.i!L___ 45,070 -,=-6& _-19,200 7,550 ,1 \
<br />('.
<br />,"
<br />13,854.730 10.150.270 73.32.307,800 1,999,250~'
<br />
<br />STATE
<br />
<br />'III'
<br />
<br />\ljhile the w~1"'1be long-tir.,c: f10~~ dt:lriv'~d in Apper.dix I is 11.,L.OO,OOO .!.cre-
<br />feet ~;early, that for th::! period of stud:: is some 545,()()() acrz-feet less. The
<br />period from 1897 to 19H. ",-'l.S that of ereatest s~ttlement in tht3 upp""r t..1.sin as a.
<br />whole, nnd ."It the .;>nd of th'Jt 17 Y~ur period uses wer.:: probably est"!.blished on a
<br />basis n~~rl~ ~s l~rge as they hav~ since ~~n. Although general gro~th continued
<br />slo~ly ~ft~r 1914 ~~d storqre ~~rticularly h~s ~l"'cwn rapidly durin~ th~ l~st 10
<br />years,. it is felt th'lt tha 30 Y~.;l.r peric.d is a r.toroe r.eppcsent'lti'/c one f:-om
<br />which to prddicl1te futu.e cond:. tions. It is felt ~Jso t.hflt the 17 yetn's prior to
<br />1914 were not i:",t'l(':ncnted with e~u!:'i: stretlffi flC<'~ record to !I1;lk:~ t.hf'l longnr rc-
<br />co:-d .'ls ro1i,bl,~ ..,~ tht'lt f th' - JO :;s-'.:, ;:,(:rioo ch.,se:'! ~',',r this study.
<br />
<br />'""",~
<br />
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