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<br />.+:0- <br />o <br />c..n <br />00 <br /> <br />. <br /> <br />in use of a given quantity diverted may not only reduce water deliver- <br /> <br />. <br /> <br />ies downstream, but the return flows may be more saline. <br /> <br />Point and natural runoff sources which are a major segment of <br /> <br />quality effects, present a different potential than irrigation flows in <br /> <br />. <br /> <br />terms of control, solutions and responsibilities. Natural sources of <br /> <br />salinity are generally associated with public lands, and hence, public <br /> <br />agencies. In contrast, irrigation return flows and associated salinity <br /> <br />. <br /> <br />largely involve private farmers and effective control presents a differ" <br /> <br />ent set of problems. <br /> <br />. <br /> <br />Agricultural response issues and options. <br /> <br />At this time it is an <br /> <br />open question that PL 92-500 is inadequate with respect to irrigation <br /> <br />return flows and salinity and will never be implemented. The Basin <br /> <br />. <br /> <br />states have been orderec1tp prepare by October 1975 an implementa- <br /> <br />tion plan to achieve a salinity level at Imperial Dam at or below that of <br /> <br />. <br /> <br />1972. PL 93 -320 was passed in 1974 as, one means of alleviating the <br /> <br />salinity problem. . Beyond this, response options for the agricultural <br /> <br />industry may include: <br /> <br />. <br /> <br />I. Voluntary farmer response based on experience, research, <br /> <br />and education relative to advantages of management practices and in- <br /> <br />vestments. <br /> <br />. <br /> <br />2. Investment in quality improvement: <br /> <br />Desalination <br />Diversion <br />Demonstration projects <br />Research <br /> <br />. <br /> <br />20 <br /> <br />. <br />