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<br />:'''''',',. <br /> <br />,-'. <br />,':}:,' ".' <br /> <br />r <br /> <br />I <br /> <br />, <br /> <br />i <br />, <br /> <br />~b; <br />~! <br /> <br />."" <br /> <br />.~ <br />N <br />.... <br />CD <br /> <br />... "., '-~., , "'-'---" . ' <br /> <br />ancl <br /> <br />-6 <br />IO <br /> <br />Mc .. chengeinsalt concentrat:l.on be~een, i1c-rigation water and ground- <br />water, ..gll; <br /> <br />Nd a number of days seepage occurs; <br /> <br /> <br />ASR .. chenge in seepage l.'ate due. t.o l:tn:Lngs, ..I clay., which. may vary <br /> <br />throughout the year; . <br /> <br /> <br />Qg a total agriculturel inputs 'to the groundwater syatem,ha-m; and <br /> <br /> <br />Ql' a phraatophytause of. grounclwater, ha..... <br /> <br /> <br />In orcler to c1evelop an opti.,al cost-effectiveness relation for lining liS <br />a ..sel:tnity <:ontrol maasure, the follow:tng p!.oblem mU6tbe aolved repeatedly <br />for various valuas of the const:l:a:Lnt value 5: <br /> <br />n <br />C~ - min r Cc(51)i <br />.i-l, ' <br /> <br />subject to, <br /> <br />(Sl)i :;. (ST) i <br /> <br />andt <br /> <br />n <br />r (51):L - S <br />i-l <br /> <br />.,,;.~ '.'.' - ' '.' i . ,...... <br />'-'"Where, <br /> <br />" -.' <br /> <br />,,;,,- <br /> <br />Ci <br /> <br />, . ' <br />'.. the min:Lmum coat of "'lining llufficie";:t' c:an,allengtha .taproduca .II. .. <br />total salinity rscluct:Lon of 5, megegrams;' . <br /> <br />C <br />0. <br /> <br />, <br />.. the coet of lining the epecif:Lecl ,length of the ith canal (Eq. 1), <br />millions of dollars; <br /> <br />(51)1 a the salinity recluction to be schieved by lining .the .ith canal, <br />Mgm/yr; <br /> <br />42 <br /> <br />. <br /> <br /> <br /> <br />(4) <br /> <br />. (7) <br /> <br />'" " <br /> <br />. <br /> <br />(5) <br /> <br />(6) <br /> <br />",""".. <br />