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arch dams auger borrow pits bottom cement cent moisture clay cofferdam compacted soil considerable core corewall creosote cross-section cubic foot cylinder dam construction depth determined downstream drain drainage area drill rods driving dry weight earth dams engineer equipment excavation factor factor of safety feet Figure fill dams FISH LADDERS flume Forest Service friction gravel gravity hardpan holes hydraulic hydraulic fill impervious inches load masonry dams material maximum method minimum moisture content mortar necessary obtained outlet particles penetration percolation rate pipe pits placed plank plasticity plasticity-needle pressure proposed dam pump reservoir basin riprap rock foundation rock-fill rollers runoff samples sand saturated sheet piling silt slope sluiced solid rock foundation specifications spillway sq.in square miles steel stratum stream structure sufficient surface thickness timber dams timber piles upstream velocity vertical voids wash boring watertightness width