I think the way to build tidal power is to dam small inlets and then run water one way on the way in and then the other on the way out. So no hydraulics just regular water at different heights spinning turbines that turn generators. Put in a second overflow spill so if the tide or the inlet ever exceeds a certain level it just overflows that. The same reason they don't build new dams and even remove old working ones is why these will never be built.
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