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<br />~ <br />o <br />c..n <br />l\J <br /> <br />. <br /> <br />open drains (open canals) for both surface and subsurface drains of <br /> <br />. <br /> <br />clay, concrete or plastic pipe. <br /> <br />The source of the water is usually of a diffuse nature and the fa- <br /> <br />cility collects it in the conveyance system converting it to point source <br /> <br />. <br /> <br />discharges where it is co-mingled with the receiving waters. Drain- <br /> <br />age technology has little or no control on the quality of water collected <br /> <br />from the diffuse sturces. <br /> <br />. <br /> <br />Erosion Control. Management of water and soil to prevent surface <br /> <br />runoff is the technology to prevent erosion by water. Such practices as <br /> <br />. <br /> <br />contour farming, terracing, strip cropping, contour irrigation, pump <br /> <br />back irrigation and land grading have been successful in preventing and <br /> <br />eliminating surface runoff and the accompanying soil erosion. Surface <br /> <br />. <br /> <br />runoff from most all irrigated land can be eliminated, so that return <br /> <br />floV'{s from this source would be small and could be controlled to a <br /> <br />. <br /> <br />minimum. <br /> <br />Problems of Agriculture Response <br /> <br />The implementation of irrigation control technology is difficult <br /> <br />. <br /> <br />because of the off-side or extended nature of the quality problem. Put <br /> <br />simply, why should a farmer in western Colorado be greatly concerned <br /> <br />. <br /> <br />or alarmed about the quality of water at Imperial Dam? Obviously, he <br /> <br />is not going to incur a lot of personal expense to improve the quality <br /> <br />downstream. His production costs do not include quality deterioration, <br /> <br />. <br /> <br />whereas the farmer downstream has larger expenses (less income) <br /> <br />t6 <br /> <br />. <br />