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<br />oot33'B <br /> <br />CHAPTER III <br /> <br />PROJECT IEVEIDPMENT <br />(Great lJorthern unit) <br /> <br />. <br /> <br />Water supply <br /> <br />The Great Northern unit would supply 96.2 percent of the ideal <br />rec;,uirements of the unit lands as estimated in Chapter II. The increase <br />in uStab1e "later supply resulting from the unit would average 29,130 acre- <br />feet annually at the head of the E1khead Canal, including 25,990 acre-f"et <br />for the full service lands and 3,140 acre-feet for the supplemental senr1ce <br />lands. Stream depletions resulting from the use of this water would aver- <br />age about 13,520 acre-feet annually. <br /> <br />Repay::lent <br /> <br />. <br /> <br />The estimated pa;yment capacity of the water users on the Great <br />Nort~ern Ul1it would amount to $26,510 annually. Approximately $25,100 of <br />t:lis amount would be required for operation, I:Jaintenan"e, anel replacement <br />costs and ~l,410 would be available for a~ortization of construction costs. <br />Thus over a 50-year period the water users wouJ_d be eble to pe,y $70,500 <br />toward. construction costs or about 2 percent of -llie total construction <br />cost of :.;4,467,000. If the unit \/ere aut:lorized, the remaining portion <br />of tile construction cost ($4,396,500) would be rC'quired from the Upper <br />Colorado River Basin Fund. The water users \/ould require a development <br />period of 5 years af+.er the first delivery of water and before the assess- <br />ment of construction charges. <br /> <br />Benefit-cost analysis <br /> <br />The benefit-cost ratio of the Great Nort'1.ern 1J:lit would be about 1 to <br />1 with both irrigation benefits and average ffi,nua1 equivalent costs approx- <br />ime.tivg ~,184,000. T.1e total ';Jenefit va1u2 wcuJd include ~93,600 in direct <br />benefits, 'r46,200 in indirect benef'its, end $4J~,2CO in public benefits. <br />The averaGe annual equivalent costs are developed below. <br /> <br />Item <br />ConstructiGn-Co3t <br />Interest during construction <br />Present worth of tennina1 <br />salvage value <br />Net capital inves-bnent <br />Ope!'ation, maintenance, and <br />replacement costs <br />Assl81ed cost of Colorado <br />River Storage project <br />Total <br /> <br />Total <br />$4,46rOOO <br />110,000 <br /> <br />AveraI!!' <br />a.Il!'ual value <br /> <br />o <br />4,577,000 <br /> <br />$125,000 <br /> <br />25,100 <br /> <br />33,800 <br />183,900 <br /> <br />Plan selection and alternatives <br /> <br />. <br /> <br />The plan outlined for the Great Northern unit in the preceding para- <br />graphs provides -for utilization of nearly all of the availabli:j su;rplus <br /> <br />39 <br />