Davidson Branch Equalization Tank and Pump Station

Davidson Branch_Quals Graphic

Background

Nashville’s wastewater collection system began in the 1820’s as an assortment of clay and brick sewers, all discharging into the Cumberland River. Over time, the steady growth of people and places drove demand for over 2,900 miles of sewers, many combining sewage and storm water. Passage of the Clean Water Act in 1975 set new water quality requirements for hundreds of cities nationwide. Metro Water Services’ ongoing Overflow Abatement Program has been reducing contaminated sewer overflows for decades. In 2009, a consent decree between the EPA and Metro set a deadline to eliminate sanitary sewer overflows and drastically reduce combined sewer overflows. The Davidson Branch Equalization Tank (6MG) and Pump Station (~15 MGD) is one of over 80 projects that will help Metro achieve its overflow abatement goals.

Results

Wilmot was chosen to lead the diverse project team’s compliance with Metro Water Services’ Sustainability Requirements. Wilmot advocated the use of the Institute for Sustainable Infrastructure’s Envision Rating System as a way to ensure a comprehensive approach to sustainable development from project design through operation. A focus on community input and coordination generated the idea of matching the facility’s facade with surrounding buildings. In an effort to collaborate with other Metro agencies, the Master Plan includes options for a future Metro Parks soccer field and Greenway extension.  To improve resource allocation the project team will both source regional and recycled content as well as reuse materials where possible. To reduce energy use an innovative pump layout is proposed to handle both the duty and wet weather pumping responsibilities. To take advantage of renewable energy the tank roof will be “solar ready”. To support the city’s long-term stormwater goals, all runoff will be captured and managed on the site. This project will be Metro Water’s second candidate for Envision certification.