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<br />. <br /> <br />3 <br /> <br /> <br />..... ,.~ ,:_1 <br />~;.;~i <br /> <br />. <br /> <br />During this study period an average of about 53,200 acre-feet ot <br /> <br />water has been diverted aimually to project lands and includes <br /> <br />water diverted tram the Purgatoire River and water diverted to the <br /> <br />Model irrigation system and from Chicosa and other small arroyos. <br /> <br />Total diversions wouJ.d have been very nearly adequate it control <br /> <br />had been available to permit deli very of water to all ditches as <br /> <br />needed to meet crop requirements. Due to considerable variation <br /> <br />in the water supply tram the Purgatoire River, ranging from <br /> <br />periods of practically no flow to floods of considerable magni- <br /> <br />tude, irrigators have diverted water to the land based on avail- <br /> <br />abUi ty rather than need ot crops. <br /> <br />Crop irrigation requirements for the project area were <br /> <br />. <br /> <br />based on a study of daily temperatures and precipitation records <br /> <br />and it is estimated that the average crop irrigation requirement <br /> <br />for the 1925-1957 study period wouJ.d amount to 1.52 acre-teet <br /> <br />per acre annually. The annual crop irrigation requirement was <br /> <br />corrected tor farm and transportation losses and the total head- <br /> <br />gate diversion requirement is estimated to be 3.l0 acre-feet per <br /> <br />acre. The total diversion requirement for the project area is <br />estimated to be about 61,200 acre-feet annually. For optimum <br />crop production the average monthly distribution of the total <br /> <br />diversion requirement through the growing season is estimated <br /> <br />as follows: <br />