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00232'Z. CHAP'IER III PROJECT DEVELOPMENT (Wessels unit) . for storage of sediment, The reservoir would have a normal water surface elevation of 7,000 feet. The dam forming the reservoir could be a rolled earth-fill structure or an arch-type concrete structure as the dam site is suitable for either type. The cost estimate Was made for the earth- fill type with the dam crest 105 feet in hei~ht above streambed and 10 feet above the normal water surface elevation. At that height the dwn would have a crest length of 255 feet, The outlet_~o~ks, with a capacity of 150 second-feet, would be a concrete-lined conduit, A spillway with a capacity of 1),000 second-feet would be provided. Wessels Canal Wessels Canal would have an initial capacity of 120 second-feet and a terminal capacity of 10 second-feet. It would be 4;.8.7 ndlel! in length, The canal would consist primarily of unlined earth section but would include 2-IDiles of lined section near its head; - 'a siphon across Oalc Creel., a;;d 1.4 miles'- of bench fiume and lined secti-ons 0 D the ste'ep 'hill- sides across the Yampa River from- Steamboat Springs. The diversion dam at the head of the canal would be an overflow concrete weir structure. 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 geological problems are apparent that would seriously hamper the construction of Bear DaIll. The dam site is located in a narrow gorge of the Yarapa River and is cut in crystalline rock. The Wessels Canal is not expected to present any construction problems except for the section of canal near SteBInboat Springs. This section would lie across steep slopes and in unstable soils and would require Bome special design and construc- . tion work, A construction period of about 2 years would be required for the unit with the work limited, because of climatic conditions, to the period from April through November. No construction camp would be required as housing facilities would be available in nearby communities. Cost estimates . The construction cost of the Wessels unit is estimated at $?,488,OOP. or $390 for each acre of full irrigation service land or equivalent, Its annual operation, maintenance, and replacement costs are expected to amount to $12,700. Estimated costs of the unit are itemized on the follow- ing page, 25