Cleanwater Nashville

Metro Water Services

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Additional updates

Dodson Chapel Project wins construction awards

Date added: 11-Aug-2015 09:31 AM

Dodson Chapel Project wins construction awardsDodson Chapel Pumping Station and Equalization Facility are the subject of two major construction industry awards.
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Cockrill Springs is ‘new’ feature of Centennial Park

Date added: 11-Aug-2015 09:28 AM

Cockrill Springs is ‘new’ feature of Centennial ParkA plan to “daylight” the historic Cockrill Spring at Centennial Park will provide a dramatic new natural feature at the park’s West End Avenue entrance while also producing water quality improvements on the campus.

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CWN infrastructure renewal projects on the rise

Date added: 11-Aug-2015 09:30 AM

CWN infrastructure renewal projects on the rise Shelby Park Rehabilitation and Cowan/Riverside Rehabilitation – began the comprehensive system renewal in vast areas of East and North Nashville. The projects will rehabilitate defective, 1960s-era sewer system pipes and service connections across many square miles of residential and commercial neighborhoods. Improving sewer system performance in these basins will reduce wet weather, sanitary sewer overflows into the Cumberland River.

Annual Rehabilitation FY2013 is a countywide project that will soon start construction to rehabilitate approximately 150 segments of isolated, defective gravity sewer lines and repair service connections.
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Metro Parks teamwork delivers West Park update

Date added: 11-Aug-2015 09:33 AM

Metro Parks teamwork delivers West Park updateAn exciting design to significantly improve the function, health and use of West Park will be completed this summer.
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Remote-controlled cameras provide eyes for underground pipe repairs

The majority of Nashville’s sewer system lies hidden beneath streets and buried in easements. Since it cannot be readily observed, Metro Water Services (MWS) deploys a variety of technologies to assess the system’s condition.

One of those technologies, known as closed circuit television (CCTV) inspection, involves viewing the inside of a pipe via a remotely-operated camera in the sewer. The camera, typically installed on a small wheel-based chassis, records video as it travels down the pipe. The video can be viewed in real time by the operator or saved for future evaluation.

CCTV inspection is a fundamental tool utilized by MWS and the Clean Water Nashville Overflow Abatement Program (CWNOAP) to assess the condition of the sewer system, including:

  • Confirming pipe material, pipe size, and location of service laterals
  • Locating obstructions such as roots, grease, or debris that may require cleaning
  • Identifying evidence of groundwater infiltration or rainfall-derived infiltration and inflow that may need to be sealed to prevent sanitary sewer overflows
  • Locating structural defects within the pipe that may lead to future pipe failures
Mounted on a wheeled “rover” chassis (shown in Photo 1), closed circuit television (CCTV) cameras provide eyes that assist with maintenance and repairs of the underground sewer system. The camera identifies cracked and broken pipe sections (Photo 2) and locations of debris, grease, or roots (Photo 3) that may block the sewer. CCTV inspection can also identify locations of unwanted groundwater infiltration (Photo 4) that reduce available capacity. Occasionally wildlife, such as a mouse (Photo 5) or a snake (photo 6), enter the system through larger defects. With CCTV inspection, defects can be identified and repaired, restoring the pipe to its proper function (Photo 6)

Detecting problems via CCTV inspection is only half the job; the next step is to fix them. If an obstruction is identified, MWS can send remotely-operated cleaning equipment into the sewer to remove the potential blockage and restore the capacity of the sewer pipe.

If significant structural defects or leaks are observed, MWS has a high-tech solution for that part, too. As long as a pipe isn’t severely damaged, MWS can use a technology called cured-in-place pipe (CIPP) lining to rehabilitate the pipe through the installation of a seamless, tight-fitting, corrosion-resistant liner within the original host pipe.

This new lining improves pipe hydraulics, restores the pipe to a structurally sound condition, and addresses leaks into and out of the sewer.