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002356 CHAPmR III PROJECT DEVELOFMENT (Yellow Jacket unit) . second-feet and a terminal capacity of 40 second-feet. The canal would be primarily of earth construction. In an approximately 7-mile long stretch below the head of the canal, heavy construction would be required because of steep cross slopes, averaging 50 percent, and considerable rock. The remainder of the canal would be of relatively easy construction. The lateral branching eaBt from the AXial Canal would head about 7 miles below the canal head. The lateral would be about 6 miles long end would have an initial ca~acity of 25 second-feet and a terminal capacity of 10 second-feet. Except for 0.31 mile of siphon across l~lk Creek ana 0.45 mile of bench flume, the lateral would be of simple earth construction. Stabilizat.ion of Natur~l Channels . Stabiliza-::ion wark, including placement of riprsp and cirop struc- tures, wo~ld be accom?lishea in portions of natural stream channels that would be used for conveyance of the unit water supply. The work would be done in a 2.2-mile long stretch of Little Beaver Creek, a 3.5-mile long section of Coal Creek, and a 1.9-mile long section of Milk Creek. Work also would be done in a natural chunnel 2.5 miles long between Yellow Jac!:et Pass end ~'hornburgh Reservoir. Laterals and Drains CC3ts of laterals and drains were estimated from general data on costs ~er acre for serving similar lands of other projects. The terrain of the la~ds is of rolling nature with many s~all cross drainages. As a result the lateral system re~uired would be simple, although scmewhat extensive. The laterals would average about 3 to 5 miles in length and wculd be located along the low divides of the small drainages. The estimates include lateral systems for the new "-ands of the division. The presently irrigated lands are considered to have adequate distribution facilities for unit development. Existing natural channels would be cleaned and straightened to provide for drailOage of unit lands. The count:-y has a good slope and probably the need for construction of new drains would not be felt until several years a,c-Ger the unit had been in operation. Conotruction Considerations . No serious geological problems are apparent in the construction of uni t features. Some sr-ecial work would be required in the design and construction of the dam at Trappers Lake, however, as the dam site is forn::ed by a termi.nal glacial moraine through which some seepage presently occurs. 59