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<br />.~-l <br />, <br />, <br /> <br />~") <br /> <br />seasons additional water is still required, and reservoir water <br /> <br />-,---- - ----- ------ <br /> <br />~ is purchased from other sources. Water from these supplemental <br />~ <br />CO <br />~ sources has amounted to an average of 1,100 acre-feet during <br /> <br />compact years 1949-72 as shown on table 2. <br /> <br />Estimates of the acreages of crops grown under the Catlin <br /> <br />canal were made using data published for Otero County in "Agricul- <br /> <br />tural Statistics, 1971." The percentage that the irrigated acre- <br /> <br />age of each crop in the county was to the total irrigated acreage <br /> <br />in the county was applied to 18,660 acres to obtain the following <br /> <br />values for crops under the Catlin canal: <br /> corn . . . . 6,120 acres <br /> grain sorghums 2,350 acres <br /> alfalfa. . . 8,140 acres <br /> sugar beets. 1,230 acres <br /> winter wheat 820 acres <br />A method reported by Jensen, Robb, and Franzoyl was used to <br /> <br />estimate consumptive use and headgate diversion requirements under <br /> <br />the Catlin system. This method has been used.successfully for <br /> <br />irrigation scheduling in several areas in the western united states. <br /> <br />The procedure involved calculation of monthly potential evapotrans- <br /> <br />piration using percent possible sunshine and mean air temperature. <br /> <br />This theoretical value was then multiplied by a coefficient which <br /> <br />allowed for the growth-stage of each crop, and which was obtained <br /> <br />from-the Agr-icultural Research servic-e.2-- Monthlyeff-e~ti';~----u <br /> <br />3 <br />