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<br />3'019S5 <br /> <br />NAVAJO RESERVOIR AND UPSTREAM TRIBUTARIES <br /> <br />Water Supplv,- <br />For purposes of water supply analysis, the historic runoff <br />of the San Juan River at the U. S. Geological Survey Blanco gaging <br />station located downstream from the dam site of the proposed Navajo <br />Reservoir has been taken as the supply of water available for addi- <br />tional upstream use and regulation by the Navajo Reservoir. The <br />period of study covers the years 1928-1956, inclusive. The committee <br />recognizes that during this same period some increase in stream de- <br />pletion has occurred from expanded use of water on the upstream tri- <br />butaries and therefore the records of runoff for the earlier years <br />of the period show more water than would be available under present <br />development. This is not considered serious as the years of acute <br />water supply have occurred in the more recent period of 1946-1956. <br />The following table gives the annual runoff of the San <br />Juan River at the Blanco gaging station. The records make allowance <br />for use by the Citizens Ditch which diverts from the river a short <br />distance below the dam site of the proposed Navajo Reservoir and <br />above the Blanco gaging station through December 6, 1954. On Decem- <br />ber 7, 1954, the gage was relocated above the point of diversion of <br />the Citizens Ditch. The recorded river flow at the new location <br />for the years 1955 and 1956 has been adjusted to reflect the diver- <br />sions by the Citizens Ditch. <br /> <br />- 5 - <br /> <br />_. .1-,,- <br /> <br />~V' _'__ "',,,,j; _';~ __L~i;~ <br />