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<br />~ 5. <br />I <br />I <br />~ <br /> <br />, . <br /> <br />. i <br /> <br />\ '~. <br /> <br />. <br /> <br />, 1 [ <br />(53)i !" -....A. ..... <br />. . .... .. i . <br /> <br />Bi .11/2 1 <br />(=~). . - BiJ <br /> <br />, <br /> <br />(13) <br /> <br />..,. <br />I\) <br />N <br />W <br /> <br />3. <br /> <br />Esuation 13 :ts solved for each (Si)i et.every successive value of <br />dCc/dSl, given by <br /> <br />:i~ .. (:;~)min + jA <br /> <br />(14) <br /> <br />where j- 0, 1, 2, 3, ; . ., k. Since all of the marginal costs ere <br />equal at each point, only the canals which have a value of (Sl)i <br />grest:er than zero are cost-effective. <br /> <br />.4. The calculat~d. valuas of (Sl)i must: be checked agaiti.sttheirrespec- <br />tive physical constraints and adjusted if neceesaTY, These con- <br />s trs:tn to are: <br /> <br />a) if 0 ~ (Sl)i ~ (ST)il then (Sl)i .. (Sl)i <br /> <br />(15) <br /> <br />b) if (Sl)i ~ 0; then (Sl)i .. 0 <br /> <br />c) if (Sl)i ~ (ST)i; then (Sl)i" (ST)i <br /> <br />(16) <br /> <br />(17) <br /> <br />. '.' <br />The constra:tnedl1aluesof (Sl)i are then ll\1bet:ituted back into their <br />. resp.act:i'111 cost-affectivenass aquation which has the form of: <br /> <br />(CC)i" Ai <br /> <br />. (S1.)i <br />(Sl)i + Bi <br /> <br />(18) <br /> <br />and the costs for all canals ere s\1lllll\edto obtein thetot:alco'st of <br />reducing salinity by S, <br /> <br />"~ I . <br /> <br />" "~ <br /> <br />'.'-" <br /> <br />q':" <br /> <br />n <br />S - t (Sl)i.' <br />i-l <br /> <br />.:;..:-;..... <br /> <br />(19) <br /> <br />',.' "',.'.:."."'. <br /> <br />, ...',. <br />'., ",',',,:v-,: ,....' <br /> <br />The coate are then annual1zad, if desirecl. Thill series of calculations <br />of S and total costs deecribe the lining cost-effectiveness relationship which <br />maybe plotted for aclditional clarity. Theiabove procecluTe is also utilized <br />to optixnize other practices and c1eve10p optimal functions for areas and sub- <br />basins. A general flo"W chart of the procedure is given in Figure 17. <br /> <br />, <br /> <br />46 <br /> <br />--" - ,,-,. <br />,..,",-., <br /> <br />",,, <br /> <br />,f:' <br />