During intense rainstorms, residents of urban areas rely on stormwater sewers to keep streets and homes from flooding. But in some cases, air pockets in sewers combine with fast-moving water to produce waterspouts that can reach dozens of feet high and last for several minutes. These so-called storm geysers can flood the surrounding area, cause damage to nearby structures, injure bystanders, and compromise drainage pipes.
Click here for original story, Stopping storms from creating dangerous urban geysers
Source: Phys.org