Laserfiche WebLink
<br />. <br /> <br />., : <br /> <br />~ <br />N <br />W <br />. ...;1. <br /> <br />! <br /> <br />"',>>' <br /> <br />'0.- <br />.1fJ <br /> <br />. . <br /> <br />where) <br /> <br />Cj A. the annual c"et of redudng.the mess emissions of aelt by mg; <br /> <br /> <br />Aj ~ unit control cost anociated with tqe. j th on-farm :tmpr<:lvement which <br />may be either linear or scale dependent; and <br /> <br />mj .. total controllable pollutant reduet:tonllchievell by fu'Ut'reatment. <br /> <br />. <br /> <br />The <1a:lues of 1.1 aTe c1efinecl fl.'omirrigation system design and can include <br />management coetll snd has the form of: <br /> <br />..~ <br />Aj R <br />j <br /> <br />(26) <br /> <br />where" <br /> <br />cj"' total annual cost of the impl.'ovement,$/ha/yr; ancl <br /> <br />Rj "' change. in pollutant emieaionaehiev~ by the j.!:!!. improvemjl\nt; <br />Mgm/ha/yr, and inCluclesthe effects, of efficiency. <br /> <br />On'::farm optimizations ere subjee.l;ecI. to ,the same' Uneer constraints presented <br />in :Eq!1ations 6 ancl 7 , but also require an additionel constraint to prevent <br />mora t:qanon~on-fa~ improvllll\ent being appl~eclllt . thesameaource.!. .~or . . ...... <br />example,' lining a heacl c1itch and con<1ersions;to sprinkler systems lire mutually <br />exClusive in most cases. This constraint .call ,bEl wcritten ssfollows: <br />j <br /> <br /> <br />n .~ <br />r A < <br />j-l f <br /> <br />n <br />r m.. <br />j-l j <br /> <br />(27) <br /> <br />whel.'EI, <br /> <br />.Af ~ the total of irrigatecl lancls,hectares;.end <br /> <br />....' <br /> <br />n "' the total number of the selected on-farm improvements to be con- <br />sicleorad fo1:'. the' arell.. ".' ' <br /> <br />~ '-.. ',',;'; ,"' ;'~'; . <br /> <br />",.-. <br /> <br />1'l0wev..",.thisconstra1nt: .couldnot be eas;L1YiOel\!de~ in ,tPes1.gebraic opti- <br />mizatiOn procedure outlined earlier. <br /> <br />Due to the linearities of annual costs fOT the various irrigation systems <br />over the range of field sizes ancl conclitionsspplicable to the Upper Colorado <br />River Basin, the eggregete on-farm strategy wss optimizecl by linear program- <br />ming. Figure 18 presents the dimensionleseoptimal combination of on-farm <br />salinity control measures to be implemented in any area in the UCRB. Figure 18 <br />also illustrates the potential range of salt recluction obtainable foreaeh <br />measure when implemented in the optimal sequence as shown. <br /> <br />. <br /> <br />60 <br /> <br />^ <br /> <br />