Protection against torrential rains. Tokyo airport | Japan

Watergate is used in Japan since 2007. The island whose coasts are highly urbanized is subject to violent storms.
Many public facilities use Water-Gate© barriers.
This is the case of the Tokyo airport but also for a very Japanese curiosity, the underground automatic parkings for bicycles.

Water-Gate© is installed just before the flood, in high traffic areas, where we can not install permanent protection which interferes with circulation.