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I was told on a tour that the Amsterdam canals are flushed through daily - now whether that's with seawater or fresh water I forget - but surely with the movement of canal traffic there it's difficult to keep the water quality 'on or the other'?
DT I get your drift, and one of the thoughts that occurred to me was, will modern amsterdam buildings suffer similar subsidence over time? Some modern buildings are quite big, if not very high, eg the Stopera at Waterlooplein. Or have they got massive piles ;)