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<br />~'n ~! M <br /> <br />..16 - <br /> <br />a. Initial State Development. <br />A supplemental report on the San Juan-Chama project by <br />the Bureau of Reclamation, dated May, 1957 recommends that <br />authorization be sought for the construction of an initial <br />stage of the ultimate plan. This first stage would divert <br />the direct flow of the Rio Blanco, the Little Navajo River, <br />and the Navajo River for delivery to the Rio Grande Basin. <br />Except for the size of conduits, the physical plan would be <br />the same as for the same features of the ultimate plan. The <br />report estimates that an average annual diversion of about <br />110,000 acre feet could be made under this plan. Provision <br />for the Dulce Project has not been made in the plan described <br />in the Supplemental Report. It is stated that development of <br />this project, if ultimately found desirable, would be accom- <br />plished through diversions from the tributaries north of the <br />Navajo River. <br />An independent review of the plan as outlined in the 1957 <br />Supplemental Report was made to evaluate the effect on down- <br />stream flows during a period of water supply such as that which <br />occurred from 1934 through 1954. Spills were determined by <br />noting the daily mean flows at diversion points, or nearby <br />stations, that exceeded the capacity of the diversion canals. <br />The Rio Blanco was assumed to spill first when the main conduit <br />capacity was exceeded. <br />