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The Waaiersluis — a fan-shaped lock

The Waaiersluis is a device invented in 1808 by Jan Blanken of The Netherlands that uses the pressure of a flow of water to close a gate against that pressure.

The quarter-circle pool in which the movable structure normally sits at repose can be fed and drained by pipes coming from and going to the canal upstream and downstream.

"Waaiersluis" op Wikipedia NL...

The length of the dam wall on the pool side of the right-angle-constructed lock doors is just longer than that of the side that will pass across the canal in order to block its passage. The pressure of the downstream flow fed in upon the larger surface of the longer dam wall is just that much greater. This allows the oparators to close the slightly-shorter side against the flow of water, assisted by horses or other additional force.

The waaiersluis was a part of the technology employed in the construction of the Nieuwe Hollandse Waterlinie, a post-Napoleonic upgrade and eastward movement of a complex military floodplain defensive system.