One survivor of the St.Francis dam disaster exited his home through the rear, uphill portion of his house. He never saw again the rest of his family, who left via the front door.

Th Santa Clara River, the drainage on which the St. Francis dam was built, is just an easy bike ride from my house. The county government center permanently displays a chilling series of photographs of the flood area taken the day after the break.

Never mind the BOB, just get out (remember to walk uphill). Same issues in a tsunami.