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0023, '0'," CHAPrER III PROJECT DEVELOP11ENT (Hayden Mes~ lli.it) . storage elevation of 7,000 feet. The dam forming the reservoir would be a rolled earth-fill structure 216 feet in height above streambed and 160 feet long at the crest. The outlet works, with a capacity of 390 second- feet, would be a concrete-lined conduit through the left fl,bntment. !-. side channel spillway, with a capacity of 1,900 second-feet, also would be pro- vided on the left abutment. East Fork Feeder Canal East Fork Feeder Canal would have a capacity of 475 second-feet and would be approximately 15.4 miles in length. The diversion dam at the head of the canal would be a concrete weir type, !>bst of the canal would be lined, but it would include some unlined sections, a siphon, a.'ld 'uench flume, At the terminus of the canal at Dunkley Creek, a chute end still- ing basin would be required. Hayden Bench Canal Hayden Bench Canal would have an initial capacity of 390 second-feet and a terminal capacity of 10 second-feet. It would be 81.5 miles in length and would consist almost entirely of unlined earth section. . Twenty Hile Park Canal Twenty Mile Park Canal would vary in capacity from lKl to 5 second- feet. It would be 15 miles long and would consist mostly of unlined earth section, Laterals and Drains Costs of laterals and drains were estimated from general data on costs per acre for serving similar lands of other projects. The drains are expected to be short, open structures leading to nearby natural water courses. Construction Considerations . No serious geological problems are apparent that would seriously hamper the construction of Dunkley Dam. Steep slopes and unstable soils along part of the East Fork Feeder Canal line would require some special work in the design and construction of that canal, The distribution canals below Dunkley Dam are not expected to present difficult construc- tion problems. A construction period of about 3 years would be required for the unit, Because of climatic conditions, the \lark would be limited to the period from April through November. No construction camp would be required as housing facilities would be available in cOlllllIlU1ities near the unit features. 31