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<br /> <br />3 <br /> <br /> <br />the aquatic environment by irrigation return flows. While <br />~ <br />~ it deals primarily with salinity, or total solids, it <br />~ <br />~ recognizes that sedimentation, nutrients, pesticides, <br /> <br />organic debris, and heavy metals, among others, contribute <br /> <br />significantly to the problem of water quality degradation <br /> <br />throughout the nation. Water uses affected are municipal, <br /> <br />. <br /> <br />industrial, commercial, downstream agricultural and <br /> <br />recreational, all of whom receive water of ever-diminishing <br /> <br />quality. Deep percolation of irrigation returns is causing <br /> <br />increasingly significant pollution of the ground water en- <br />vironment in many parts of the nation. <br />