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<br /> <br />~ <br />~ <br />C> <br />0) <br /> <br />5. <br /> <br />Degradation of water quality can be costly to the <br /> <br />consumer. Adverse economic effects on municipal, industrial <br /> <br />and commerical users often necessitates increased and <br /> <br />expensive treatment. Agriculture frequently experiences <br /> <br />impaired crop yields and greater water use requirements. <br /> <br />Deep percolation, often required to leach salts below the <br />plant root zone, may introduce toxic levels of nitrates into <br /> <br />the aquifer. <br /> <br />6. Improved and modernized on-the-farm water management <br />practices represent the most feasible approach to the <br />abatement or elimination of water qualitv degradation caused <br /> <br />by irrigation return flows. An acceptable control program <br />includes the application of recognized technology at the <br />pollution source. This is in harmony with the time-honored <br />concept that pollution be abated at the source rather than <br />by applying treatment to the contaminated waters. <br /> <br />7. Demonstration and pilot control projects designed to improve <br /> <br /> <br />on-farm irrigation efficiency should be afforded high priority <br /> <br /> <br />in the overall effort to abate pOllution created by irrigation <br /> <br />returns. <br /> <br />8. Legal and institutional factors combine to constrain more <br />efficient water practices, particularly in the Western <br /> <br />5 <br /> <br />