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fluid mechanics fluid concrete survey viscous fluid sewers aggregate test abrasion test impact value crushing value aggregates rain water infiltration runoff rain water rain water absorption matrix analysis structural analysis stiffness method load distribution soil mechanics vertical stresses hoist hoisting equipments geotechnics geography mechanics of solid strenght of material stress curves water supply system distribution of water structure beam column arial survey identifiy object disaster management earthquakes seismic zones drainage house drainage drainage traps study fluid water flow boundary layer seperation boundary seperation turbine hydraulic study hydraulic power hydro power hydro power generation soil loads soil load distribution load stress infiltration permeability landslide mass movement rockfall deep failure of slopes debris flow slope stability industrial hoist construction hoist belt conveyor components of belt conveyor dragline drag-line excavator explosive demolition construction demolition house demolition pumping centrifugal pump reciprocating pump scraper traction sluice gates navier stokes turbines mechanical energy specific energy macro enconomic gravity action