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<br />water should contain no more than 500 mg/L of TDS (total <br /> <br />~. <br />c..:"t <br />(;.'J <br />I-'- <br /> <br />dissolved solids). <br /> <br />For irrigators, the higher salinity concentrations cause <br /> <br />decreased crop yields, altered crop patterns, increased <br /> <br />leaching and drainage requirements, and increased <br /> <br />management costs, Agricultural losses (either through <br /> <br />lower yields or increased production/management costs) <br /> <br />begin when salinity levels of applied irrigation water <br /> <br />reach 700 to 850 mg/L, depending upon soil conditions and <br /> <br />type of crop grown, A summary of the effects is presented <br /> <br />below: <br /> <br />Mg/L and Effect Table <br /> <br />In the late 1960's and early 1970's, leaders at the <br /> <br />regional and national level began to recognize the problem <br /> <br />and seek solutions. <br /> <br />THE SOLUTION <br /> <br />In 1972, an amendment to the Federal Water Pollution <br /> <br />control Act, Public Law 92-500 and subsequently the Clean <br /> <br />Water Act of 1977, Section 303, set forth a public policy <br /> <br />embracing the restoration and maintenance of water quality, <br /> <br />pollution effluent discharge limitation, and eventual zero <br /> <br />4 <br />