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<br />..-.l <br /> <br />~ <br />...... <br />, . <br /> <br />station consists of Hesporus flow, tributary inflow, and roturn flow, <br />all diminished by Colorado irrigation uses. <br /> <br />-- <br /> <br />c <br /> <br />Annual run-off at the state Line has averaged 29,000 acre-feet <br />since 1921, varying from a minimum of 8,400 in 1934, to 69,700 in 1941. <br /> <br />During the irrigation period of April to October, La Plata River <br />flow deviates widely from monthly irrigation requirements, as shown in <br />the following tabulation: <br /> <br />Distribution of Run-off, La Plata Rivor <br />at Colorado-New Mexico State Line <br /> <br />Total <br /> <br /> Average run-off, Ideal <br /> 1921 to 1940, inclusive irrigation <br /> demand <br /> Acre-fest Percent Percent <br /> .' <br /> . <br /> 7,400 . 33 6 <br /> . <br /> 7,300 32 13 <br /> 3,100 14 27 <br /> 1,200 5 23 <br /> 900 4 2l <br /> 1,100 5 7 <br />. 1,500 7 3 <br />. <br /> : <br /> 22,500 100 . 100 <br /> <br />Month <br /> <br />April <br />May <br />June <br />July <br />August <br />September <br />October <br /> <br />operation - New Mexico Division <br /> <br />Under pressnt conditions the New Mexico ditch diversions con- <br />form to the erratic flows of La Plata River arriving at the 5tate Line. <br />After May the river flow declines rapidly, almost to negligible <br />quantities. <br /> <br />The 'function of State Line Reservoir is to store winter run-off <br />and seasonal flows of La Plata River with outflow regulation in accord- <br />ance wi1lh irrigation needs. Since the irrigation capacity of 12,000 <br />acre-feet is inadequate for both seasonal regulation and yearly carry- <br />over storage,' . complete regulation of water available to <br />New Mexic 0 usors cannot boo prOVided. Peak flows of high-water years <br />like 1920, 1927, and 1941 would continue to pass unused to San Juan <br />River. <br /> <br />State Line Reservoir would furnish seasonal amounts of water, <br />regulated in accordance with crop needs, for 3,800 acres, as shown in <br />table 1. and on the operation graph (drawing No. 56-D"'323) covering <br />the 13-year analytical study of 1928-1940 (with Long Hollow Reservoir, <br />of l2,OOO acre"'foot capacity, assumed to be in operation for the <br />Colorado area without Colorado encroachment on the New Moxico Inter- <br />state Compact allocation). <br /> <br />24 <br />