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<br />10 <br /> <br />October; only 16.4 percent came in the eight months January tbrQugh August. The <br /> <br />year 1932 produced the largest annual discharge for period 1900-64, but as most <br /> <br />of water came late in the year, irrigation water would have been in short supply <br /> <br />under today's conditions. <br /> <br />U. S. Share of Rio Grande Water <br /> <br />The speculation as to amount of water avai1- <br /> <br />able has been removed somewhat by 1. B. & W. C. Computations that show estimated <br /> <br />U. S. share of Rio Grande flow at Falcon Dam site for period 1900-53 are included <br /> <br />in Senate Doc. 65, 86th Congress, 1st Session; table 3, p. 72. The 1954-63 figures <br /> <br />were computed by I. B. & W. C., and 1964 was computed according to treaty pro- <br /> <br />visions, using I. B. & W. C. published records. <br /> <br />The theoretical U. S. share of annual flows at Falcon Reservoir, for yea,1"s <br /> <br />1900-64, are listed in table 8, column 2. Also listed in table 8 are: the 10-year <br /> <br />ming averages of annual flows (col. 3); the di'fference between the average annual <br /> <br />flow fOl the 65 year period and each annual flow (col. 4); and the algebraic accu- <br /> <br />mulation of the annual differences (COl. 5). <br /> <br />Annual flows and 10-year running averages were plotted as top graphs of figure 4 <br /> <br />(p. 41). The average annual flow for the 65 year period is 1,706,000 acre-feet, <br /> <br />but the average for the last 20 years is only 1,356,000 acre-feet; this reduction <br /> <br />in average flow is reflected in the 10-year miilg average. The average of the <br /> <br />ming averages for the last 10 years is 1,395,000 acre-feet, which may be con- <br /> <br />sidered a dependable annual volume Of flow into Falcon Reservoir; however, this <br /> <br />period includes the severe drought of the 1950's, and a greater volume might be <br /> <br />allotted with safety. The accumulated departures of each year's flow from the <br /> <br />average flow (table 8, co1.5) were plotted to define the lower graph of figure 4: <br /> <br />An examination of this graph shows that the departure varied uniformly about the <br /> <br />mean until 1919 when accumulated departures became greater and st~ed greater until <br /> <br />1961, a period of 43 years. This does not mean much, but does indicate that more <br /> <br />than the average flow could safely have been used during the period. <br /> <br />,-, ,~! r, r f' '''''l <br />....1 ". t......<., \) <br />