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<br />COLORADO RIVER STORAGE PROJECT
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<br />
<br />Just'ifia.bl. irrigation expenditure
<br />The just,ifinble irrigation expeDditure for (,he Colomdo River
<br />storage project is limited (,0 the maximum bene.flts that could be
<br />Itttributed to (,he storagc water replacement function or the costs of
<br />the most economical alternlttive single-purpose replacement storage,
<br />whichever is the lesser, The Itlternative single-purpose costs were
<br />found to be substantially less thltn the bene.flts und tbus were taken
<br />as the just,ifiuble expend i (,ure , Both the benefit,s aud the nlternative
<br />costs are discussed in the following sections.
<br />Benefits,-The maximum benefits tlmt could be attributed t,o the
<br />wnter replacement fnnct,ion of the storuge project I1re tnken as t,he
<br />benefits in excess of locnl const,ruction Itnd opemting costs of future
<br />water-consuming projects in the upper basin over the IOO-year
<br />period of annlysis, Consideration WitS given only to tlte. be,nefit.s I1nd
<br />costs n.ssociated with irrigation, municipal, and industrial use. The
<br />excess of the benefits over costs for the 100-year period WI1S est.imated
<br />by projection of the ,excess benefits nnt.ieipa(,ed for the II init.iltl
<br />participating projects, The projections were 1ll>1de on the bltsis of
<br />the Itverago vltlue of excess benefits per Itcre-foot of streltm depletion,
<br />In order to arrive at n conservativE' estimo.t(~l however, the excess
<br />benefit value determined for t.he initial pl1rticipl1tmg projects was
<br />slightly lowered whell relltted to other future projccts. Also the
<br />cOInputations were based on the we.ight,ed av('rng(~ inel'ease in stream
<br />dcpletions of 1,800,000' acre-fe.ct over the 100-yeor period ruther thnn
<br />thc projected total incrcase of 2,9:,0,000 Itcre-fcet by the end of the
<br />period. Derivntion of the excess benefits is BUlllluarized in the
<br />following table.
<br />
<br />Excess annual bcnefi-!.s of :initial parlicipalinu project8 and projection for future
<br />water-con8uming projects 1
<br />[fn thousands]
<br />
<br /> Averago
<br /> Anuual Ilwruast:<l excess
<br /> AIUIUl\t AUllul\1 beuoflts QllIlUal bcnefUs
<br />PBrU('lpnf.lng projects boue!Hs cost.q lut1x{:f'sS stream perncre-
<br /> of costs oeplr.tion foot of
<br /> (ncre-It'ct) stream
<br /> depletIon
<br />Pnonlll._____________._______._._.____..____ $610 $236 $404 10 $40
<br />Plno nlver oxtonslon______________________ "" 178 331 28 12
<br />Smith Fork____________________________.__ 150 110 40 8 ,
<br />Florlda_.___.__._____._____._______._______ "1 221 120 13 ,
<br />Sl1L._._____._________._______._.__,_.______ "S 111 87 6 16
<br />HaIDIDond_._______________.______l._______ 202 8< 118 , 13
<br />Contral Utah______________________________ 1i,562 .5,317 245 189 1
<br />Emory County____________________________ 4211 208 128 16 8
<br />Scedskadeen_...... _ _ _ _ ___. _. _ ._u_ _ _ _. _ __ 1,567 89.') fJ74 110 6
<br />Lyman__. __ u. _.. _. _. _ _ _. _ _ __ _ _ __ _ _ _ _ _ _ _ __ 388 38< 4 0 0
<br />La Dlngo__________________________~_______ 206 " 137 14 10
<br />Subto1.aLn___________________._____ 10,189 7,001 2,28S 403 6
<br />Total proJect(ld nvo\"nl!o Includlng'rutmo {l,OOO 1,800 5
<br />projects Cor 100-YE\8.T pcrlorlh _...:. __ --- ...---.----- u_______
<br />, .---
<br />
<br />l Inoludos only tlJose bcuoflts assoclaLod with IrrignUon, municipal, ann Inrll1strlal watt'J',
<br />
<br />As shown in the table, the eshllll1t,e of t,otul exeess benefit.s for t.he
<br />100-yelt!' period of Itnulysis amounts to an Itverage of $9 million annu-
<br />ally, The present woroh of this annual amount ove... aIOO-yea... period
<br />at 2)f percent interest is about $330 million.
<br />Alternative single-putpose eosts.-The Itlternative single-purpose
<br />irrigation costs of the Colorado River Storage project were estimated
<br />2~927-~8-3
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