Steve Wood asked:
> How about pumping water out of the main tank with the boat in
> to the floatation tanks either side and below? That way
> overall weight stays the same so the sides don't rise but the
> boat inside drops...
Because if there are empty flotation tanks either side and below the
space your boat is to occupy, the caisson will float so high in the
water that you won't be able to get your boat in!
David Mack
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