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1947 Discussion alinement apparatus ASCE Atlantic average bank beam bend canal at Panama Canal Zone Cape Cod Canal center line Chagres River change of level channel depth channel width compression test construction Continental Divide curves daily capacity developed dredge drilling and blasting effect existing canal flood-control flow ft deep ft wide gages Gaillard Cut Gamboa Gatun Dam Gatun Lake hard rock hydraulic increase indicated knots lane large naval vessel length Liberty ship loading lock canal lockages Madden Lake maneuvering material maximum method model tests muck navigable pass operation overhaul Pacific tide Panama Canal Panama sea-level canal Pedro Miguel pilots present canal rainfall reservoir restricted channel result rudder angle required scale ratio selected ship speed shown in Fig slides slopes spillway sq miles static studies Table tidal lock traffic transit triaxial compression unconfined compression velocity water level water surface waterways yawing