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000716 -3- III. AFTER THE SOIL MASS HAS FORMED A DAM Rent large 30 to 50 cubic feet per second pumps. However, no high capacity pumps are available in Colorado. If this option is considered, we should take into account the large amount of electricity power required to run the pumps. (See figure 7 for power requirements). Pumps are usually available for rent in Texas and Florida. The rental fee is approximately $l,OOO/month/pump. The pumps from Texas could be shipped, be on _the job, and operational in 24 hours. That is if the pumps are available. ;;.< . / B. ~ " 5." . '..<1:2 I D. 5. - . j~f-;;,1-I!F. , > A. Construct a ava i lable. in 1983). tunnel. This option is feasible when competent material is (Such as the tunnel constructed in Utah at the Thistle Slide However, it is time consuming and expensiye. A good portion of the area upstream of the slide could be inundated before the tunnel is functional. Blast rock or haul in rock and let the rock form a drainage path for the water to flow through. This is dangerous. The slide dam could fail along the rock/soil mass face. C. Construct a siphon. This is difficult since the slide continues to move. Experience at the Thistle Slide dam has not been Pos1itive. The siphon pipe was pulled apart as the soil mass continued to move. E. Use dynamite to keep the channel open. The use of dynamite is more suited with solid rock. Dynamite does not work too well with soft material as will most likely be encountered in a slide. Divert water or store water upstream. At the Vail/Minturn potential slide area, one 5 percent of the drainage area is protected with a dam. Dams should be considered but will probably not be a major consideration in most potential slide areas. G. Release water from storage to help flush out the slide material. H. A combination of the above. LHD:pka/5216H