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003156 fI' CHAJ:'l'ER I PLANS OF DEVELOPMENT Plan D-6 The same South San Juan project area would be served under this plan as in Plans D-4 and D-5. The Navajo Reservoir would be constructed to a capacity of 822,000 acre -feet including an active capacity of 460,000 acre -feet. The joint Main Gravity Canal would be constructed 140 feet higher than the canal planned for the 121,700-acre Shiprock project alone and would have a capacity of 2,140 second-feet and a length of 30 miles. Water for both projects at the end of the joint Main Gravity Canal would drop 109 feet through a penstock to hydraulic-turbine -driven pumps. From the pumps, water would separate the same as in Plans D-4 and D-5. The water would be raised 374 feet above the pumps to irri- gate the same acreage with the same penstock size and capacity as in Plans D-4 ahd D-5. Ths same lateral and drainage system would be required as in Plan D-4. , Plan E-4 .. The same South San Juan project area would be served under this plan as in :?1an D-4, except that lands on Pauline Mesa above the Ship- rock Main Canal would not receive water but the scattered tracts near the mouths of largo and Munoz Canyons would be irrigated. The principal difference in D-4 and E-4 plans is in the :means of conveyance of water from Navajo Reservoir to the land. Under Plan E-4 the Shiprock Main Canal planned for the 100,000-acre Shiprock project alone would be en- larged to a, capacity of 1,640 second-feet to convey water for both proj- ects from Navajo Dam to a pumping plant, a distance of 38 miles. The same 2,270 acres irrigated by gravity as in Plan E-l would be served with this plan. The 370 second-feet of water for the remaining 18,180 acres would be pumped 395 feet in a 7-foot-diameter pipe from a plant located at the entrance to Kutz tunnel (under New Mexico Highway No. 44) to the Carson Canal. With the Shiprock Main Canal diverting from the Navajo Reservoir 175 feet lower than the Main Gravity Canal in Plan D-4, less storage ' capacity in the reservoir would be required. A total reservoir .capac- ity of 524,000 acre-feet would be required, of which 302,000 acre-feet would be active capacity, 12,000 acre-feet would be dead storage, and 210,000 acre-feet would meet silt storage requirements above dead stor- age elevation for 100 years. The same lateral and drainage system as described in Plan D-4 would be required to Serve the project lands. . 13 ,