tldr: How can I, (temporarily and quickly), keep at least some amount of leaking water dammed and away from a wall?
I live in a three unit condo. In the basement, there is a cheaply constructed wall dividing my portion from my two neighbors. The floor of the basement slants significantly towards my part of the basement.
There is a modest water leak through the exterior wall in my neighbors' half the basement, near the dividing wall. It's a little damp for them, but they aren't really experiencing a huge issue with it. What's really happening is that all of the water is immediately flowing through/under/around the dividing wall and pooling in my half of the basement. It's actually pretty remarkable how quickly the water flows away from them and through the wall.
Because of the lack of impact, they don't quite sense the urgency of fixing the issue. We all keep odd hours, so I haven't been able to really show them the extent what's going on in my basement.
Is there any way that I can easily dam up the base of the wall so that, when the water leaks, it at least stays near the leak? I don't want to be a jerk neighbor - they'll get it fixed eventually - but its beginning to damage the stuff I have in storage and I need it stopping now not at some ill-determined point in the future.