Cleanwater Nashville

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Lakewood office reflects communications priority

Date added: 11-Aug-2015 09:32 AM

Lakewood office reflects communications priorityCommunity outreach is an important component of Clean Water Nashville. Before work starts on every project, CWN identifies neighborhood stakeholders so that all parties are aware of the purpose, impact and work schedule.
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Compact drives water quality education

Date added: 11-Aug-2015 09:29 AM

Compact drives water quality education Throughout this summer, the Cumberland River Compact is hosting a high-profile series titled Innovations and Solutions. The series focuses on the most pressing environmental, legal and political issues facing our local waterways. Clean Water Nashville Director Ron Taylor was honored to participate in the April launch of the series.
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Cumberland River Compact driving water quality awareness and education

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

Cumberland River Compact driving water quality awareness and educationEnvironmental awareness and education is vitally important to the health of the Cumberland River and area creeks and streams. Nashville is fortunate to have community partners such as the Cumberland River Compact dedicated to improving the watershed.

The Cumberland River Compact, a group of citizens and community leaders, created the Cumberland River Center to lead protection of the river against pollution, drought, storm water runoff and other challenges.
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2011 Collection System Structural Defect Repair project completed

Date added: 11-Aug-2015 09:26 AM

2011 Collection System Structural Defect Repair project completedThe 2011 Collection System Structural Defect Repair project involved repair of wastewater infrastructure across an expansive area of the Whites Creek and Richland Creek drainage basins in northwest and west Nashville. The project is the largest so far from a geographic standpoint, spreading across 10 Metro Council districts.

Work included repair to cracked and broken system pipes that had begun to leak and diminish system capacity. The program’s contractors used closed circuit television cameras, extended by cables into the pipe system, to identify deterioration and catalog more than 25 major repairs.
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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.