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abutment acre-feet acres approximately axis station backfill bars basalt basalt flows bid price blasting borrow area borrow pit bottom Bureau of Reclamation closure section Columbia Basin project Columbia River compacted concrete consisting construction cost Crab Creek crest elevation cubic feet cutoff trench dam embankment depth designed directed the contractor discharge Drilling grout holes Drumheller channels elevation 960 embankment settlement excavation feet downstream feet long feet per second Figure Frenchman Hills gate chamber Grand Coulee Dam grout cap hand-auger holes high-pressure gate holes were drilled inches irrigation Lake layers Lind Coulee flexure located maximum water surface miles O'Sullivan Dam operation Order for Changes outlet pipe overburden piezometer placement Potholes Dam Potholes reservoir pumping Quincy Basin reinforcement riprap roadway sand and gravel settlement installations shaft silt slope sluiced spillway steel stilling basin suitable rock trashrack structure trucks tubing tunnel lining U. S. Bureau valve house zone 1 material