[drummer]

Don't know about this project, but several underground parking garages have vault doors to section off areas of the garage, as needed. If flooding occurs, they prevent it from continuing on to other areas to protect people, cars, and the rest of the building. Think of it like sections of a ship. They can be manually opened or closed through a computer system or work off of sensors. I can't get any more technical than that, however...that's the limit of my knowledge on this subject. I've just seen a bunch in the city I used to live in in China that was right on the Yangzi River - and freak rains could bring large-scale flooding.