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<br />'it' <br /> <br />. <br /> <br />creased by an a?Orage of 122,000 acre-feet.per annum. <br />In addition to the increase in diversions, the water used <br />can be drawn from the reservoir as needed, at the will of <br />the beneficiary. <br /> <br />On Drawing SLV-50 are indicated the aetunl diversions made <br />between Del Norte and Alamosa for the period 1915 to 1938, <br />inclusive, tho 670,000 acre-feot annuol irrigation require- <br />ment, and the water supply of the Rio Gr~nde at Del Norte. <br />The black area represents the actual diversions, as made <br />for each year from 1915 to 1938. The heavy dotted lino <br />running above the stippled area indiclO'.tes the annunl ir- <br />rigation requirement of 670,000 acre-feet. The stippled <br />aren represents the amount of water thnt will be made <br />nvnilable, over and above the omeunt of water that was <br />actUAlly diverted, during the period 1915-1938. The in- <br />creased diversions represented by the stippled aren av- <br />erage about 131,000 acre-feet per annum. <br /> <br />, <br /> <br />The two questions - how much "new water" is needod and <br />how much "new water" is avnilnble have been confused by <br />some. The questions might be stated in this fashion: <br />How much "new wnter" is required in to.d<li tien to wha.t has <br />been diverted te supply the annup~ requirement of 670,000 <br />acre-feet and is there tho.t much surplus water available? <br />Both questions can be answered by referring to Dro.wing . <br />SLV-50. There is more than enough water for the opern- <br />tion of Wagon ~beel Gnp Reservoir. In fact, there would <br />be substantial spills for practically all yenrs between <br />1907 and 1930, even if the reservoir operation is worked <br />out on a very conservative basis. <br /> <br />.<> <br /> <br />The years of 1931 and 1934, when the water supply wns <br />only about one-half of normal, can well be remembered. <br />The ground water supplies in 1931 were materially de- <br />pleted. That is tho first year since their construction <br />that most of the drainage canals were dry. In 1932 the <br />run-off Was large. Very large quantities of water (the <br />maximum of record) were diverted up to the capacity of <br />the canals for days at a time. Such excess diversions, <br />however, did not bring the ground water supplies up to <br />their average levels. <br /> <br />, <br /> <br />In 1935 conditions were quite similar to those in 1932, <br />and again large quantities of water were diverted in an <br />effOrt to bring to normal the grou-~dwater levels. <br /> <br />1. <br /> <br />g <br /> <br />1771 <br />