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<br />IX) <br />- <br />l'o <br /> <br />The Upper Colorado River Commission Staff, in order to become <br /> <br />better acquainted with the project operCltion, prepared an operation study of <br /> <br />the area for the period 1953-1950. This period was selected for several reasons: <br /> <br />1. The U. S. B.R. Water Supply Appendix to the Feasibility Report <br /> <br />presented operation studies using the period 1929-52 and it was not felt <br /> <br />necessary to duplicate their work. <br /> <br />2. The 1953-60 period is one of severe droug!:t. In fact, during <br /> <br />the period of record at the station Little Snake River near Lily. Colorado only <br /> <br />1934 had less runoff than three of the years ('54, '59 and '55) during the <br /> <br />period. Yet ono year, 1957, as shov.-n in Tables 1 and 2, was exceeded <br /> <br />only four times in the 30 year period 1931-60. Therefore. in the relative <br /> <br />short perlod of 8 years we have drought and abundance. <br /> <br />3, U. S. G, S. streamflow records are available at all but two of <br /> <br />the stations to be used in the study, thereby reducing the task of extending <br /> <br />streamflow records by correlction. <br /> <br />Tabulations of streamflow at the selected gaging stations are <br /> <br />shown in Tables 3 through 12. <br /> <br />The Bureau of Reclamation developed consumptive use dCltCl and <br /> <br />diversion requirements for the area. These computations were reviewed and <br /> <br />accepted. Table 13 presents the basic irrigation requirements for the major <br /> <br />project area and the Two Bar Area as determined by the Bureau. <br /> <br />From land classification surveys by the Pureau of Reclamation <br /> <br />the irrigated and irrigable acreage within the proJ ect area was determined. <br /> <br />The findings of the Bureau are sumrr.arized in Table 14. <br /> <br />- 3 - <br />