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1}03338 . CHAPTER III POTENTIAL IRRIGPIl'ION DEVELOPMENT near the San Juan River in the southeast end of the project ares ~,~ are more scattered than the lands as a.whole under Plan A. Plan A-l would require the same project works as Plan A but its canals and reservoir llould have larger capacities and the canal distribution system would be extended to serve the additional acreage. The inlet canal to Perry Draw Reservoir would have a capacity of 100 second-feet. The total capacity of Perry Draw Reservoir would be increased to 7,000 acre-feet and its active capacity to 6,800 acre-feet. A cost of $125 per acre was estimated for the construction of all outlet canals, farm laterals, and drains of Plan A-l. The benefit-cost ratio is 0.83 to 1 which is a little less favorable than for the smaller scale of development under Plan A. . Plan A-2. - .Plan A-2 would provide ~. still larger scale of development than Plan A-l but would utilize essentially the same features as Plans A nnd A-l. It would serve an area of 6,000 acres. Tbe additional lands are located on Dutton and Stollsteimer Creeks and thus the project acreage would be less compact than in either Plan A or A-l. Perry Draw Inlet Canal would be constructed to a capacity of 150 second-feet. The total capacity of Perry Draw Reservoir would be increased to 9,000 acre-feet and its active capacity to 8,Boo sere-feet. The distribution system required would be more extensive than for Plan A or A-l. A cost of $150 per acre was estimated for construction of outlet canals, farm laterals, and drains. The estimated benefit-cost ratio is 0.79 to 1 which is sliehtly lower than for PlanS A and A-l. Plan B.--Plan B would serve 3,600 acres of land on Martinez Creek near Stevens Ranch, on the head of Stollsteimer Creek, and along the San Juan River. The main project works would be a dam and reservoir at the O'Neal Park site located largely in secs. 26, 35, and 36, T. 36 N., R. 3 U. The project works also would include a diversion dam on Piedra River as in Plan A, a 4o-second-foot inlet canal to O'Neal Park Reservoir fol- lowing a route somewhat different from that in Plan A, and a 1,700-foot outlet tunnel from O'Neal Park Reservoir to the Martinez Creek drainage. O'Neal Park Reservoir would have a total capacity of 17,500 acre-feet and an active capacity of 8,100 acre-feet. With the large dead storage pool in thc reservoir, the outlet works would be at an elevation high enough to permit service of the project lands without an unduly long outlet tunnel. Costs of outlet canals, farm laterals, and drains were estimated at $150 per acre. The estimated benefit-cost ratio of Plan B is 0.77 to 1. . Plan B does not include lands along Gordon and O'Neal Creeks and surrounding O'Neal Park Reservoir. These lands are at such high elevations that they could not be served from the reservoir. Also they could not be furnished a full water supply from Piedra River because of the river's low and erratic late summer flows and prior rights to the water. 34