Elsphnt our block of flats is built over a very small canal, but a canal none the less. that flows under the ground under the flats. there are about twenty flats here, ours is a ground floor flat. and they are supposed to do something put something to stop the canal water coming up, we have very thick concrete, but as you know congrete will just soak water up, so there is supposed to be something between the canel and the concrete, but it isn't working, so the concrete is soaking up the canal water, well I suppose it is Canal water. when we moved in it was completely dry, no damp anywhere. now we have two large patches in the hall way, and we think one in the living room. hubby has taken up half the hall way carpet. we have the heating on and hopefully that will dry it.
We were ttold by the surveyer that a couple from another block had to move out for two weeks while their whole flat was damp proofed.

I hope we don't have to do that.