narrower concept back wave Concept backflow Concept cavitation Concept current Concept deep sluice Concept discharge (flowing) Concept discharge (shooting) Concept discharge of floodwater Concept discharge of low water Concept discharge rate Concept discharge section area Concept energy conversion Concept energy loss Concept flow Concept flow net Concept flow process Concept flow resistance Concept hydraulics Concept overflow Concept power balance Concept pressure surge Concept roller Concept roughness Concept seepage pressure Concept subsidence Concept surge Concept turbulence Concept velocity of flow Concept wall friction Concept wave Concept wave force Concept wave pressure Concept wave velocity Concept whirl Concept