Sump pump installation
To combat the mostly-minor water accumulation trouble in the basement where the studio is being built, we decided to put in a sump pump. This wasn't a minor undertaking by any stretch, and I don't recommend doing it unless you absolutely need it or you love annoying dirty projects. For us, it was the former: there's no way we could take a chance with water accumulation being a problem in the studio. The sump will keep the water level well below the basement floor at all times so we don't get water leaking up through the cracks.
(That's Bill in the pictures.)