i thought that the "leave lock empty rule" was to do with silting - i guess less water, less silt.
TBQH I only shut the gates if it is very late and there is a chance that no-one else will be coming through. My logic is that there is a chance that the next user will be travelling in the opposite direction and can go straight in, if they are not then the poor buggers travelling in the same direction will have to shut the gates as well, but with hydraulics that is not onerous, HOWEVER that will result in exactly the same number of gate openings as if you had shut them, whereas if someone goes straight in there are fewer, so OVERALL less energy, less wear and tear.
I used to shut them when they were manual, seemed only fair.
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"Beer; the cause and solution for the world's problems..."
Homer. (Simpson)
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