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Pipeline 5 Upgrades in North San Diego County Halfway Complete

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This week, crews are installing a carbon fiber lining inside Pipeline 5 in North San Diego County between Fallbrook and Escondido. The work is essential to maintain the 96-inch pipeline that delivers untreated water from Lake Skinner in southwest Riverside County to the Lower Otay Water Treatment Plant in southern San Diego County.

The work began at the end of March when Pipeline 5 was shut down for the installation of two internal steel bulkheads. The bulkheads allow the rest of the pipeline to stay in service while work is performed in an isolated section.

“Ensuring that water supplies continue to be reliable for all of the region’s 3.3 million residents and businesses is our priority,” said Jim Fisher, director of operations and maintenance at the Water Authority. “We are performing this essential repair to one of our largest pipelines to make sure that there are no interruptions in service to our member agencies.”

The carbon fiber installation is anticipated to be complete by the end of next week. Carbon fiber is a highly effective solution to reinforce the stressed areas of the pipe and extend its lifespan.

Proactive asset management program detects issues before they arise

Pipeline 5 was built in 1982 and is a part of the Water Authority’s Second Aqueduct, which includes Pipelines 3, 4 and 5.

In August of last year, Water Authority staff detected a leak in nearby Pipeline 4 at Moosa Creek and inspected the other two pipelines at that location. During that inspection, Pipeline 5 showed signs of stress, where the operating pressure within the pipe exceeds 400 pounds per square inch. A failure of the large-diameter pipeline would cause significant damage to the environment and nearby pipelines.

The proactive and timely repair to Pipeline 5 is part of the asset management program, which is a key element of the Water Authority’s commitment to providing a safe and reliable water supply to San Diego County. Making preventative repairs to large-scale infrastructure ensures that regional water service will continue uninterrupted.

After installation of the carbon fiber is complete, a second shutdown to remove the isolation bulkheads is anticipated to take place in May, after which the pipeline will return to normal service.

Protecting the health of essential workers during COVID-19

To ensure safety and health, most Water Authority employees have been working from their homes since mid-March. For those employees who need to be at work sites, strict precautions are being taken by limiting the number of people present, maintaining physical distance, requiring all employees to wear protective gear and providing hand washing stations where possible.

Crews install a carbon fiber liner in Pipeline 4 in October 2019 to give the pipeline several more years of service while a longer-term solution is developed and deployed.

Pipeline 4 Repairs Completed In North San Diego County

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Pipeline 4 – one of the San Diego region’s major water pipelines – is back in regular service after a leak was repaired, a testament to the San Diego County Water Authority’s proactive asset management program.

The pipeline resumed normal operations November 10 after nearly two months of modified operation. The leaky section was near Camino Del Rey in Bonsall, in an area with no adjacent homes or businesses.

“The shutdown and repair work went smoothly, and we could not have done it without the support and coordination from Water Authority staff, our contractors and member agencies, particularly, Fallbrook PUD, Rainbow MWD, Valley Center MWD, and Vallecitos Water District,” said Neena Kuzmich, Water Authority engineering manager.

Carbon fiber section will protect Pipeline 4

Water Authority crews detected a leak in the 90-inch diameter Pipeline 4 in the Moosa Canyon area in August.

Crews installed bulkheads in the pipeline to isolate the leak area for repairs. The bulkheads allowed the pipeline to continue treated water deliveries throughout the county in a modified fashion and restored full service to retail water agencies.

The Water Authority installed a carbon fiber liner to give the pipeline several more years of service, while a longer-term solution is developed and implemented.

Once the repairs were completed, a second shutdown was needed to remove the bulkheads and return the pipeline to full, normal operations.

Pipeline 4 is one of five major pipelines operated by the Water Authority.

Crews installed a carbon fiber liner to repair a leak in Pipeline 4 in north San Diego County.

Crews installed a carbon fiber liner to repair a leak in Pipeline 4. The liner will give the pipeline several more years of service while a longer-term solution is developed. Photo: Water Authority

Proactive approach keeps pipelines healthy

By relining the pipes and conducting timely repairs with the latest technology, the Water Authority has avoided major pipeline failures for more than decade.

Extending the life and reliability of major pipelines is one facet of the agency’s proactive asset management program. Real-time monitoring and other pipeline assessment tools help the Water Authority avoid pipeline failures by identifying potential problems in advance.

As part of its proactive approach, the Water Authority continually assesses and rehabilitates pipelines serving the San Diego region. The agency operates 310 miles of large-diameter pipelines, along with 1,600 aqueduct-related structures, and approximately 100 metering/flow-control facilities.

Approximately 82 miles of the pipelines are pre-stressed concrete cylinder pipes. These types of pipes were installed between the early 1960s and late 1980s and have experienced premature failures and shown areas of degradation.

In the past few years, the Water Authority has continued to extend the service life of pipelines with relining projects, including Pipeline 3 between Lake Murray and Sweetwater Reservoir, and Pipeline 5, in the Fallbrook area.