Quote:
Originally posted by svandamme
i still think i get half the credit
lifting boats without the water brings in a whole other problem in the picture, can't be easy to drain, support, lift then flood the thing again...
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Granted, partial credit is in order as your points are valid; however the primary reason for lifting the water is that it eliminates variability in the lift weight and allows for counterbalancing. Smaller lift motors, less energy expended, etc.
Roman aqueducts, if I recall correctly were never used for navigation partly because they made all their turns at right-angles. Does anyone have info on a Roman aqueduct with radius turns??