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CHAPTER IV PLAN FORMULATION . by an inlet structure would be conveyed to the reservoir by the Morapos Feeder Canal as shown on the following map. Releases from the reservoir into Milk Creek would be rediverted by the Milk Creek Diversion Dam about 4.5 miles downstream and carried to the irrigable lands by the Milk Creek Canal and lIes Lateral. Water for future coal uses such as coal gasifi- cation and powerplant cooling could be supplied directly from the reser- voir or at any point downstream where it may be needed. Water for the White River Segment would be diverted from the North Fork at a point just upstream from its confluence with the South Fork. Water diverted from North Fork would be pumped by the White River Feeder Pump through the first 1,000 feet of the White River Feeder Conduit to a point where it would flow by gravity. The end of the conduit would branch to form the Yellow Jacket Conduit and the Oak Ridge Canal. This relationship is indicated more clearly on the map. The Yellow Jacket Conduit would carry the water supply for year-round coal industry and municipal use and for surface irrigation in the summer. The Curtis Creek Canal for irrigation would be an extension of the Yellow Jacket Conduit. The Oak Ridge Canal would carry water for surface irrigation southeast of Little Beaver Creek. Excess flows in the White River Feeder Conduit would be released into the enlarged Lake Avery for storage and pumped back into the conduit by the Avery Pumping Plant for project uses as needed. ..", As there would be no project diversion or storage releases for,oil shale processing, minimum streamflows in the lower mainstem would not be provided. Provisions for recreation and fish and wildlife are des- cribed at the end of the next section. Project features The project features described below are summarized in Chapter V with those for each of the other plans. Thornburgh Reservoir ,~ :. Thornburgh Reservoir on Milk Creek would have a capacity of 36,000 acre-feet and a surface area of 840 acres at normal water surface eleva- tion, 6,716 feet. About 30,000 acre-feet of the capacity would be active and 6,000 acre-feet dead and inactive. ,.' Thornburgh Dam would be a rolled earthfill structure rising 129 feet above the streambed and 755 feet long at the crest. The spillway would have a, capacity of 3,100 second-feet at maximum water surface elevation, 6,724 feet. The outlet works would be capable of releasing 160 second- feet with the reservoir water surface at elevation 6,675 feet. 36