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<br />N <br />..... <br />CD <br />, tloJ' <br /> <br />FIGURES <br /> <br />Number <br /> <br />Page <br /> <br />1 <br /> <br />Conceptual decomposition model of a regional <br />or basin salinity control strategy . . . . . <br /> <br />. . <br /> <br />18 <br /> <br />2 Desalting cost function for an RO system having <br />feedwater at 4000 mg/~ and product water at 500 <br /> <br />mg/9., . . . . . . .. ......... <br /> <br />28 <br /> <br />3 <br /> <br />Schematic diagram of a typical desalination <br /> <br />system . . . . .. ........... <br /> <br />30 <br /> <br />4 Diagram of typical multi-stage flash distillation <br /> <br />system . . . . . . . . . . . . . . . . . . . 31 <br /> <br />5 Illustration of the basic vertical tube evaporation <br /> <br />effect . . . . . . . . . . . . .. .... 35 <br /> <br />6 Schematic diagram of VF-VC desalting process 40 <br /> <br />7 Generalized view of a electrodialysis desalting <br />process. . . . . . . . . . . . . . . . . . . 43 <br /> <br />8 Flow diagram of typical RO desalting system. 46 <br /> <br />9 Illustration of basic RO process 46 <br /> <br />10 ~on exchange desalting process 49 <br /> <br />11 Relationship of plant capacity and desalting costs <br />for various systems. . . . .. ..... 57 <br /> <br />12 Effects of feedwater salinity concentration on <br />desal ting cos'ts. . .. .......... 59 <br /> <br />13 Comparison of concrete and buried plastic pipeline <br />lining costs . . . . . . . . . . . . . . . . . . 70 <br /> <br />14 Graphical representation of sprinkler irrigation <br />pniformity analysis. . . . . . . . . . 75 <br /> <br />15 Dimensionless cost functions for various types of <br />pressurized irrigation systems ....... 80 <br /> <br />vi <br />