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003155 fI' CRAnER I PlANS OF DEVELOPMENT Plan .u-'l- This plan is for a small South San Juan project of 20,450 acres of nel\reservation lands and provides for pumping by hydraulic-turbine prime movers. The 1,640 second-feet of water for the South San Juan project and the 100,OOO-acre Shiprock project would be conveyed 30 miles through a highline Main Gravity Canal from the Navajo Reservoir to a point 105 feet below the site of the drop described in Plan D-l. This section of the canal would serve 1,430 acres of South San Juan project lands on Pauline Mesa, but it would not serve the scattered tracts of land shown on the map as near .the mouths of Largo and Munoz CanycW!. The remaining water for both projects at the end of the joint Main Gravity Canal would drop 138 feet through a penstock to hydraulic- turbine-driven pum]?s. At the pumps the water would sep9.rate into two flows. That for the Shiprock project would provide pumping power and then continue by gravity flow in the Shiprock project canal, and that for the rell\9.ining South San Juan project lands would be pumped to the Carson Canal at an elevation of 6,104 feet. The water would be raised 375 feet above the pumps Xn an 8-foot -diameter pipe with a cap9.city of' 387 second-feet to irrigate 19,020 acres. - Navajo Reservoir for this plan would have a total cap9.city of 774,000 acre-feet, of which 302,000 acre-feet would be active, 425,000 acre-feet would be dead storage, and 47,000 acre-feet would meet silt storage requirements. With these cap9.cities, sedimentation estim9.tes indicate a 100-year period of operation before silt deposition would begin to encroach on the active irrigation cap9.city. A lateral system to distribute water to all project lands would be required. Only about 400 acres of the project lands are expected to require drainage by artificial means. Plan D-5 The same South San Juan project area would be served under this plan as in PlAn D-4. The Navajo Reservoir would be constructed to a .capacity of 766,000 acre-feet, including an active capacity of 390,000 acre -feet. The joint Main Gravity Canal would be constructed 151 feet higher than the canal planned for the ll3,900-acre Shiprock project alone and would have a capacity of 1,960 second-feet and a length of 30 miles. Water for both projects at the end of the joint canal would drop 119 feet through a penstock to hydraulic-turbine-driven pumps. From the pumps, water would sep9.rate in the same manner as in Plan D-4. The water would be raised 381 feet above the pumps to irrigate the same acreage with the same penstock size and capacity as in Plan D-4. . The same lateral and drainage system would be required as in Plan D-4. J2