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<br />..... <br />L'" <br />C\J Water Requirement <br /> <br />The water required for full irrigation has been estimeted from a <br /> <br />consideration of the water used on a number of Bureau of Rec18mation <br /> <br />projects with similar soil and climatic conditions and also from heat <br /> <br />unit calculations of the consumptive use of yeater with allowances for <br /> <br />deep percolation and the losses to be encountered between the point of <br /> <br />diversion from the natural stream and the place of use. The n\wner of <br /> <br />day degrees over 32 computed from temperature records of the Rifle <br /> <br />~:eather Bureau Station was found t? average 8,656 per year over a period <br /> <br />of years. This applied to the Lowry-Johnson curve of consumptive use <br /> <br />gives 2.20 feet as the annual consumptive use. Of this, 1.95 feet is <br /> <br />required during the growing season; the balance or 0.25 feet is required <br /> <br />during the non-growing season and will be fully supplied frOlll precipitation. <br /> <br />Taking into aCCOltnt the effective precipitation during the growing 8eason, <br /> <br />May through September, of 0.41 feet, the water to be 8upplied from <br /> <br />irrigation is reduced to 1.54 feet. <br /> <br />Farm waste and deep percolation below the root zone requires that an <br /> <br />excess of water be applied in order to have 1.54 feet available for <br /> <br />consumptive use. These 108ses have been estimated at 30% of the water <br /> <br />-1-.' <br /> <br />applied, thus requiring an annual farm application of 2.20 acre-feet <br /> <br />per acre. <br /> <br />The land under the Grass Valley Canal is served water from the end <br /> <br />of the canal near the Harvey Gap Reservoir and from the reservoir which <br /> <br />is supplied water from the canal. The land is in compact bodies with <br /> <br />relatively short canal and lateral runs. Losses have been estimated not <br />