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<br />N <br />C": <br />C": <br />-' <br />, -1 <br />c::d <br /> <br />Eight per cent of the run-off at Hesperus occurs in the <br /> <br />non-irrigation season, November 1, to March 31, and is mostly <br /> <br />lost for lack of reservoirs. Occurrence of the remainder <br /> <br />does not coincide with the irrigation demand as can be seen <br /> <br />from the following tabulation: <br /> <br />Table 8 <br /> <br />Distribution of Run-off La Plata at Hesperus <br /> <br />Average Run-off at Hesperus <br />1918 to 1939 <br />April to October. inclusive <br /> <br />Ideal Irrigation Demand <br />in <br />Percent <br /> <br /> Acre-feet Percent Colorado New Mexico <br />April 5,900 19 4 6 <br />May 1l,'i1J0 37 14 13 <br />June 7,700 25 24 27 <br />July 2,300 7 22 23 <br />August 1,600 5 21 21 <br />September 1,500 5 11 7 <br />October 700 2 4 3 <br /> 31,400 IOO 100 100 <br /> <br />Storage is necessary both to regulate the availablo supply to <br /> <br />the irrigation demand and to utilize escaping flood and winter <br /> <br />j <br /> <br />waters. <br /> <br />As storage to conservo winter flow and regulate stream flow <br /> <br />to irrigation demand is the first essential to utilization of <br /> <br />the local supply, surveys were made of all available reservoir <br /> <br />sites. <br /> <br />31 <br />