FEMA Mitigation Best Practices: Louisiana City Requires Backflow Valves as a Preventive Measure   [open pdf - 32KB]

"Since the invention of plumbing, residents of cities in flood-prone areas have faced the same smelly hazard: sewage backflow. In these low-lying areas, flooding can cause sewage to back up through drain pipes into homes and businesses. The resulting messes can create serious health hazards and resist cleanup efforts."