Sluice gate for river - has pivots about horizontal axis above its lower edge due to hydrodynamic pressure

摘要

The sluice gate for rivers or canals pivots about a horizontal axis above and reasonably close to its lower edge, so that the hydrostatic and hydrodynamic forces help to maintain the plate closed or open as necessary. The sluice gate may operate automatically so that, when the water reaches a certain height above the pivotal axis of the gate, the hydrostatic pressures cause the gate to tilt. This lifts its lower edge and allows water to flow out until the pressure above and below the pivotal axis equalise, causing the gate to close.