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<br /><t"" <br /> <br />, ~ ~:,' .,: <br /> <br />'v ;. .- ~ ' <br /> <br />, <br /> <br />,. <br /> <br />~. <br /> <br />..' <br /> <br />"." <br /> <br />,-,-.--..-..,,-"-;;... <br /> <br />where, <br /> <br />~ <br />~ <br />W <br />W <br /> <br />6SE ~ reduc't1,lcTl in' Salt loading. 'du.... to ,improved application effic:!.encies, <br />in megagrams per y....r per hectare. <br /> <br />Evaluation of the term, AE , is a difficult task. 'It requiTes that <br />existing efficiencie..be ehllrac~erized ancl that e~ectecl efficiencies for <br />potential improv..ment.b.. pred10t:able. Bothtllsksar..eompoun<lell by the <br />highly vaTiable and diffus.. nature of irrigation.y..tems. Howev..r, for the <br />purposes of this repOTt, attainable applioation effieienoi.... in Table 4 were <br />used. <br /> <br />TABLE 4. SUGGESTED MAXIMtjM ATTAINABLE IRRIGATION APPLICATION EFFICIENCIES IN <br />THE UPPER COLORADO RIVER BASIN. <br /> <br />Irrigat:ton Method <br /> <br />Maximum PTobable Attainsble <br />Efficiency <br /> <br />Gat.ed Pipe <br />Siphon Tube-Furrow <br /> <br />eO <br />60 <br />80 <br />80 <br />85 <br />90 <br /> 60 <br />75 <br />90 <br />80 <br />. <br />.' ';"" <br /> <br />" . <br /> <br />AutomaticCutbeek Furro"W <br /> <br />. Automatecl. Gatecl Pipe Furrow <br /> <br />Sprinklers <br /> <br />Drip <br /> <br />Bo.rclers <br /> <br />Level Basins <br /> <br />Automat..d Basins. <br /> <br />,Tailwater . Reuse Systems <br /> <br />",' <br /> <br />-..C,. ,." <br /> <br />',".'." <br /> <br />,'.'; <br /> <br />'Cos,t?fIrrigl1tion Syst.SlIlS--,," ..' .. . .". ...... ....., ,.., . <br />',. .'.,; ,'!A' generalmo<tel d.es'cribing :trr:tgatiori. system "co.st's"for vaiip.~s'..;f,!lnti1'lg'.. <br />conditions is not read:tly available. It is. not a difficult task to. estimate <br />th..s.. costs if the specific conditions at t~e farm are known, but in the <br />absence of this information, inigation improvSlIlent co..ts are usually given as <br />representative values. The cost estimates presented here are ..nnu..l costs per <br />hectare and inolude capital and construction costs, oper..tion ancl maintenance <br />costs, and pumping ..nergy costs. These cost estimates are current as of <br />January, 1980. <br /> <br />. <br /> <br />56 <br /> <br />.. ,<-.,." ' <br /> <br />,'.>, <br /> <br />, .. ; ,.." " , : '~" ',) <br />