Cleanwater Nashville

Metro Water Services

News

Additional updates

Driftwood Equalization Facility modifications completed, doubling facility's capacity

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

Driftwood Equalization Facility modifications completed, doubling facility's capacityThe Driftwood Equalization Facility, located on the eastern edge of downtown Nashville, off of Hermitage Avenue on Visco Drive, has been modified to store an additional 3.2 million gallons of combined sewage during peak rain events. This project is a means of reducing or eliminating wet weather overflows during major rain events.

By raising the concrete walls at Driftwood’s open storage facility and installing six new weir gates, CWN has doubled water detention capacity to almost 7 million gallons.
[read more...]

Lakewood Infrastructure Improvement Project Open House held

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

Lakewood Infrastructure Improvement Project Open House heldConstruction will begin in January 2014 to renew water and wastewater infrastructure in the Lakewood community. In advance of that construction, a community open house was held to provide community members information about the project, which is part of a citywide initiative to meet the U.S. Clean Water Act and replace aged infrastructure to benefit future generations.

The project will modernize Lakewood’s water, wastewater and stormwater infrastructure, the results of which will include improving water flow, reducing standing water during big rain events, and addressing sewer overflows.
[read more...]

Clean Water Nashville Program supports the Cumberland River Compact by entering the Dragon Boat Race!

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

Clean Water Nashville Program supports the Cumberland River Compact by entering the Dragon Boat Race!Each year the Cumberland River compact hosts the Cumberland River Dragon boat festival, which includes a daylong series of Dragon boat races along the Cumberland River at Riverfront Park. This year the Clean Water Nashville Program supported the festival, including entering a team in the Dragon Boat race competition held on September 7.
[read more...]

Lakewood improvement plans advance

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

Lakewood improvement plans advanceClean Water OAP continues preparation for a major infrastructure renewal project in the Lakewood community. The project will include updating aged water and wastewater infrastructure and addressing longstanding problems of localized flooding in yards and roadways caused by stormwater.
[read more...]

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.