ELI5: Explain Like I'm 5

Water brake

Water brakes are a way of slowing down or stopping a machine or vehicle. To use a water brake, a special container is filled with water, then connected to the machine or vehicle. When the machine or vehicle needs to be slowed down, a valve is opened on the container. This allows the water from the container to flow out, creating resistance and slowing the machine or vehicle down.
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