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If the max flow is when the height distance is the greatest, wouldn't
the tide change wave be like a pyramid instead of a sine wave?

Guys, I think more thought needs to be given to what cause Tides (Moon)
and rotation of the earth. It isn't just a simple hydraulic solution.

Now a question; 1 point (to be awarded by Donal): If the Earth makes
one rotation in 24 hours and the Moon rotates around the Earth making
one revolution, why does high tide time vary daily?

Ole Thom