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<br />.,. <br />DC1208 <br /> <br />. <br /> <br />.. <br /> <br />. <br /> <br />aDX\1:.&l diacharge at. this station for the study period 1925 to 1949 to. . <br /> <br />be 65,lOC acre-feet. 01' this total flow, an average of about 54,000 acre- <br /> <br />feet annually has been diverted for irrigation use in the project area. <br /> <br />In addition to this supply about 500 acre-feet annually have been di- <br /> <br />verted by the Model irrigation system from Chicosa and other small arroyos. <br /> <br />23. Part of the irrigation water supply comes from the base flow <br /> <br />and snowmelt runoff, but a large part comes from unpredictable summer rain <br /> <br />storms. The water supply is very erratic with considerable variation <br /> <br />from year to year and month to month. Usually only a small portion of the <br /> <br />water needed late in the growing season is available. Ditches having late <br /> <br />priorities are chronically short of water and even ditches with the earli- <br /> <br />est rights experience periods of short supply. Because of the erratic and <br /> <br />variable nature of the water supply, it has necessarily been the practice <br /> <br />to divert water to the land whenever water was available in the river. <br /> <br />Such a practice does not permit optimum use of the irrigation supplies <br /> <br />for maximum crop production. Winter irrigation is also commonly practiced <br /> <br />in an endeavor to conserve at least part of the winter flows through1n- <br /> <br />creasing the soil moisture content in the cultivated fields. <br /> <br />24. Water requirements. - From an analysis of crop requirements <br /> <br />based upon a study of daily temperatures and precipitation records, it is <br /> <br />estimated that the average consumptive use of irrigation water for the <br /> <br />I <br />i <br /> <br />j <br />I <br />~ <br />~ <br />. <br />