When exposed to or filled with water though, they become a heavy anti-flood wall. One popular brand, Quick Dams, offers "self-activating" barriers and "sandless sandbags." The bags contain lightweight ...

Expandable barriers like this one from a company called Dam Easy can be more effective at sealing doorways. But they're also more expensive than sandbags and water-filled barriers. Permanent barriers: ...

For the past three years, engineering consultant Michael Antinelli has worked with the city of Miami Beach and its residents to draw up individualized flood-prevention plans. So far, he’s visited 140 ...