I have many lots with basements.  Since installing AL, all of my basements are now "flooded."  Fortunately my sims are sort of dimwitted and don't know they are wading around in chest-deep water! Also, in neighborhood view, these lots show a lot of "sand" radiating out from them.
the only way I have worked around this is to build a duplicate of the basement room on a new upper floor of the house, (so I can remember how it is arranged), then demolish the basement room, and relevel the terrain.  Then exit lot, re-enter and rebuild the basements, which then work fine-- no flooding.  And the "sand" disappears in neighborhood view.  What a lot of work though!  I wonder if Maxis can ever release a new pack that is bug-free from the get-go?  Pre-release, they should hire a dozen simmers to test these lots-- Maxis people must not know how to really play through the game!  Seems all of us "ordinary players" are the ones to easily find all the bugs-- after official release!