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<br />2. Drainage ditches should be designed, constructed, and <br />maintained so as to minimize ponding in the channels and <br />to insure free flows at all times. <br /> <br />3. Provision should be made to prevent water from ponding <br />behind spoil banks. <br /> <br />4. Underdrains, culverts, inlets, etc., should be placed on <br />grade to prevent ponding. <br /> <br />C. Irriaated Farms <br /> <br />1. The sponsoring agency and other organizations concerned <br />with irrigation agriculture or mosquito control should <br />do everything possible to encourage irrigation farmers <br />to use the following irrigation and drainage practices <br />which will prevent or minimize mosquito sources: <br /> <br />a. The farm supply system, drainage system, and field <br />layouts should be properly fitted to the topography, <br />soil, water supply, crops to be grown, and irrigation <br />methods to be used. <br /> <br />b. All surface irrigated fields should be properly <br />leveled or graded to provide for efficient water <br />application and removal of excess water without <br />ponding. <br /> <br />c. An adequate drainage system should be provided for <br />removal of excess water from all portions of the <br />farm. <br /> <br />d. Irrigation methods should be used which will provide <br />optimum irrigation efficiencies. <br /> <br />e. Application of irrigation water should be limited to <br />that required to fill the crop root zone plus <br />unavoidable losses and excess water needed to prevent <br />upward movement of salts. <br /> <br />F-2 <br />