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Gibson Creek Equalization Facility

Project Scope

This project consisted of the construction of a 10 MGD pre-stressed concrete tank and a 22 MGD pump station. The storage tank is utilized when sewer flows exceed the sewer system’s capacity. The peak flows are stored in the tank until the flows in the system recede, and the stored volume can be conveyed through the system to treatment.

Location:

Madison, TN

Client:

Metropolitan Government of Nashville & Davidson County, TN Department of Water & Sewerage Services

How do you quickly and efficiently mitigate the wastewater treatment risks associated with historic flooding and aging infrastructure in a region experiencing rapid growth?

Challenge Faced

Due to rapid population growth, significant wet weather events, and aging infrastructure, Nashville’s wastewater system was incredibly strained and needed significant improvements. Inconsistent flow rates complicated wastewater treatment processes, creating substantial risks to the biological environment along the Cumberland River in one of the region’s most popular tourist destinations – downtown Nashville.

Solution Provided

Working with Metro Water Services, the Tennessee Department of Environment and Conservation, the U.S. Environmental Protection Agency, and Clean Water Nashville, Reeves Young was the general contractor for the infrastructure improvements to the Gibson Creek EQ facility. The team was responsible for installing a 10 MGD prestressed concrete tank and a 22 MGD pump station that would buffer flows to the wastewater treatment plant caused by variants in influent flow due to extreme weather conditions. When the pump station overloaded and too much wastewater came through, the system would divert to the equalization tank until the water settled down. Then, the wastewater would be allowed to drain back into the regular system, preventing the storm system from backing up. This equalization minimized the modifications required for treatment and resulted in superior operation of the wastewater treatment process. It also played a key role in rainwater overflows and excess sewage, preventing untreated wastewater from overflowing into nearby rivers and streams. The project also incorporated 15 access doors manufactured with materials that resist corrosion, which frequently occurs in wastewater management facilities.

10 MGD Pre-stressed Concrete Tank

22 MGD Pump Station

15 Corrosion Resistant Doors

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