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."
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