This is how the water flow after opening a sluice gate of a reservoir. Here, it's only a few centimetres opened up but the flow is very powerful.
Sluice gates
A sluice gate is a water flow control system. These devices can be found in a variety of areas, including water treatment plants, mines, dams etc. The gates are usually made of wood or metal, and they open and close vertically on a frame, allowing water to flow out of or be trapped in an area. They're also known as a sluice gate valve because of this.
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