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6-foot high-pressure abutment showing acre-feet adit approximately backfill to elevation base slab batch bentonite borrow area borrow pit bronze channel and stilling cofferdam contractor control house cost Cott crest cubic foot cubic yards cut-and-cover cutoff collars cutoff trench density design flood discharge channel downstream conduit downstream toe drain drilled Dry backfill embankment embankment materials equipment excavation feet wide fill flood control storage floor flow foundation gate chamber gate hanger glacial grout cap high-pressure gates Hydraulic inlet structure intake structure James River Jamestown Dam Jamestown Reservoir load located maximum Missouri River Northern Pacific Railway NUMBER operations outlet channel percent pervious Pierre shale pipe placed pounds per square pressure conduit reinforced concrete riprap river channel sand and gravel second-feet shale shown on figure slope specifications spillway and outlet spillway discharge square inch station steel stilling basin Stutsman County sump sump pump tests vertical wall zone 2 material