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<br />'I\)' <br />00 <br />0' <br />>4> <br /> <br /> <br /> <br />SECTION 3 <br /> <br />RECOMMENDATIONS <br /> <br />The results of this project should be extended to the basin <br />level development of optimal salinity control policies in the <br />Upp~r Colorado River Basin, the Rio Grande River Basin, and <br />others facing critical salinity management decisions. These <br />studies are needed to provide agencies having the responsibility <br />for implementing salinity control programs with information that <br />will maximize the effectiveness of funds and manpower. The <br />dimensionless curves distributing costs and salt loading re- <br />ductions (or return flow rates) should be used in lieu of the <br />costly investigations necessary to define such relationships <br />in each individual subbasin or valley. <br /> <br />The models presented in this report have only been partially <br />tested with respect to the sensitivity to important parameters <br />and assumptions that were made during the formulations. This <br />work should be completed to not only establish the reliability <br />of the models but also to identify the field data having the <br />most impact in determining the optimal salinity control <br />strategies. Since these models are dependent on predictions <br />made by more detailed hydro-salinity simulation models, the <br />sensitivity to the simulation model assumptions and parameters <br />should also be evaluated. <br /> <br />The costs of building and operating desalination systems <br />shQu1d be updated in the form utilized in this report. Tech- <br />nological advances since 1972 need to be included as well as <br />inflationa1 cost increases not completely encompassed by <br />various cost indexes. More efforts are also needed in evalu- <br />ating the costs of irrigation system improvements. <br /> <br />Evaluative techniques for defining irrigation efficiencies <br />in large areas with available or easily collected field data <br />should be developed for the water quality planning agencies <br />and consultants. <br /> <br />6 <br />