Birmingham Water Works Board (BWWB) of Birmingham, Ala., has consistently achieved the rating of the number-five water system in the United States...
It can be costly for municipalities when lift station check valves fail and leak sewage back into the wet well from force mains, although it is an everyday occurrence. Pump wear—as well as the operational expense of inspecting, cleaning, repairing and maintaining check valves—is well documented. Also understood is the expense of force main sewage backflow into the wet well having to be pumped multiple times. This paper is a brief discussion of the techniques and use of inline duckbill all-elastomeric check valves to prevent force main sewage backflow.