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<br />movement of the runoff is excessive, serious erosion may <br /> <br />~ <br />~ occur and valuable topsoil lost (Figures 4-7) <br />~ <br />~ <br /> <br />Runoff may have high turbidity imparted by sediment. <br /> <br />Eroded soil particles may transport adsorbed contaminants <br /> <br />such as pesticides, fertilizers, and organic material. <br /> <br />Tailwater is exposed to other pOllutants and may contain. <br /> <br />non-adsorbed pesticides that were applied directly to the <br />soil or washed from the plant by rainfall or sprinkler <br /> <br />irrigation. Soluble fertilizers, soil amendments, animal <br /> <br />wastes and organic constituents may also be found among <br /> <br />tailwater pollutants. Evaporation accounts for further <br /> <br />concentration of dissolved contituents. Finally, excessive <br /> <br />application may cause a significant rise in temperature <br /> <br />resulting from storage in pools, canals, laterals and <br /> <br />ditches (4). <br /> <br />Bypass water ordinarily acquires relatively little <br /> <br />additional contaminant inasmuch as it represents water <br /> <br />routed through conveyance canals and ditches and which is <br /> <br />returned directly to the stream without having been applied <br />to the land. It too, is subject to concentration through <br /> <br />evaporation and may be consumptively used. <br /> <br />13 <br /> <br />. <br /> <br />