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nr~~"3 U:,J 'J .....v - SYNOPSIS Under the broad captipn "South San Juan project", vari"us possibilities have been investigated for diverting water of the San Juan River and its tributaries for the irrigation of some of t!te vast expanses of arable dry land .located within the river basin and south of the river in northwestern New Mexico. The possibilities that appear most promisir~ have been investigated in reconnaissance scope and are compared in this report. A compa!'ison of the various alternatives for tha South San Juan project is only one of the steps necessary in the formulation of a plan for the over-all development of the San Juan River. Tbese alternatives must be weighed against the other potentialities for using the limited water supply, New Mexico's compact apportionment of Upper Cnlorado River Basin water, including possibilities for exporting part of the water southeastward to the Rio Grande llasin before a final choice of the basin plan can be made by the State and other interc;sts concc""nbd. This report, although treating primarily only one phase of the ba8iL situation, pro- vides data that will be useful in considering the broader problem. . In addition to data on the South San Juan pr~ject, the report presents in Chapter VIII the results of a cursory analysis of potential power developments on the San Juan River and its tributaries upstream from the most favorable storage site (Navajo) for the South San Juan project. The effect on these power potentialities of the various alter- natives for irrigation development on the San Juan River likewise should be considered in formulating the basin plan. Among the earliest plans f('\r the South San Juan project was one (Plan A) that would divert water high ~n streams tributary to the San Juan River in Colorado and convey it southward 90 airline miles to lands in the J30utheastern part of the basin. Later, the Bureau of Indian Affairs investigated the Shiprock project that would store water lower down on the San Juan River at the Navajo Reservoir Sit6 and. release it for use on Indian lands south of Shiprock, N. Mex. Ir..vestigations Were then made of possibilities for joint USe of the Sniprock project storage and diversion facilities, with enlargement as necessary, to irrigate lands east of the Shiprock project area. These pcssibilities also have been explored as a part of the South San Juan project investigations. .. Ths scale of devslopment of the Shiprock project, yet to be finally determined, will affect the plan and ec('\nomy of the South San Juan project. In this reconnaissance analysis three different Shiprock project acreages were assumed at 100,000 acres, 113,900 acros, aud 121,700 acres. Upon each of these three bases the South San Juan pr0ject was projected for economic comparisons as an incremental addition at two differ~nt acreages. Each of these six projections was studied underalterllatives of the pumps for the South San Juan project beir.g powered by electric motor or by direct-connected hydraulic turbines, making a total of 12 alternatives in 1..