Cleanwater Nashville

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Additional updates

Washington CSO Control Facility goes online

Date added: 11-Aug-2015 09:35 AM

Washington CSO Control Facility goes onlineA major combined sewer facility providing optimization for wet weather storage, screening and control of floatables and solids went online in April of this year. In addition to providing treatment, the facility dramatically reduces the number of overflows at the Washington outfall, and reduces the volume of overflows by approximately 90 percent annually.

Constructed at a cost of approximately $17 million, it was operationally complete in time to meet the Consent Decree milestone.
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Update on the Metro Nashville Consent Decree Program

Date added: 11-Aug-2015 09:34 AM

Update on the Metro Nashville Consent Decree ProgramOn August 6, 2012, Scott Potter and Ron Taylor of Metro Water Services provided an update on the Clean Water Nashville Overflow Abatement Program program to the Metro Council. This presentation addressed the status of the Consent Decree and planned projects included in the Long Term Control Plan for Metro Nashville Combined Sewer Overflows (Long Term Control Plan update) and the Corrective Action Plan/Engineering Report.Click here to download a copy of the presentation.
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Natural setting shapes repair approach

Goal is limiting environmental impact

DAVIDSON COUNTY’S SURROUNDING environment is an ever-present factor in how the Clean Water Nashville Program plans construction repairs on aged and defective wastewater infrastructure.

The Westchester Drive Rehabilitation project, located in the Belshire community between Belshire Drive and Dickerson Road in northern Nashville, is a prime example of the efforts to minimize construction impacts and limit environmental disturbances.

This project will rehabilitate approximately 3,850 linear feet of sewer pipe that runs along and crosses underneath the North Fork of Ewing Creek, a Whites Creek tributary. Cracked 10-, 15- and 18-inch diameter pipes within this local system have been allowing rainfall, creek water, and groundwater to seep in and take up capacity in the sewer system. This kind of infiltration may result in flow rates that exceed the capacity of the sewer system, resulting in sanitary sewer system overflows.

The program team evaluated two options to update the infrastructure in the project area. One option was to dig out the extensive pipe system and install new infrastructure, an approach that could cause considerable disturbance to the creek, including removal of established vegetation along the waterway.

The second alternative, which was selected, was to rehabilitate the current sewer system through a method known as “cured in-place pipe lining.” In this trenchless rehabilitation method, a pipe lining is placed in the existing sewer and is cured to form a rigid pipe within the existing sewer that effectively seals cracks and prevents water infiltration.

Rehabilitating the existing sewer pipe infrastructure rather that replacing it with new pipes will achieve the same outcome while minimizing impact to the North Fork of Ewing Creek.

Westchester Drive Rehabilitation construction began in June and is scheduled to be complete in November 2015.