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Proactive Pipeline Repair Maintains Water Supply Reliability, Affordability

/in , , /by /Water News Network Quoted: San Diego County Water Authority

The San Diego County Water Authority is proactively fixing a 90-inch diameter pipeline in Bonsall. The work is part of the agency’s long-term commitment to maintaining regional investments in water supply reliability and affordability.

Water Authority staff detected potential pipeline weaknesses just north of West Lilac Road in late January using real-time acoustic fiber-optic monitoring. This technology locates distressed sections of pipelines even while they are in use as part of the Water Authority’s high-tech asset management program.

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Successful Pipeline 4 Repair Saves San Diego County Ratepayers Money

/in , , /by /Water News Network Mentioned: San Diego County Water Authority

Tens of millions of gallons of water will soon be flowing again through a major pipeline in North San Diego County following a successful repair on Pipeline 4 near Bonsall. The repair is part of the Water Authority’s proactive approach and long-term commitment to maintaining regional water supply.

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Proactive Pipeline Repair Maintains Water Supply Reliability, Affordability

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The San Diego County Water Authority is proactively fixing a 90-inch diameter pipeline in Bonsall. The work is part of the agency’s long-term commitment to maintaining regional investments in water supply reliability and affordability.

Water Authority staff detected potential pipeline weaknesses just north of West Lilac Road in late January using real-time acoustic fiber-optic monitoring. This technology locates distressed sections of pipelines even while they are in use as part of the Water Authority’s high-tech asset management program.

Further investigation prompted the Water Authority to prioritize repairs on a 48-foot-long section of pipeline. Water Authority staff are carefully monitoring the pipe section around the clock while preparing designs and identifying contractors that can quickly mobilize for repairs.

Water supply affordability

Plans are to shut down and drain that stretch of pipe starting March 1. Work to replace the pipeline segments will continue until the line is back in service approximately 10 days later.

“This repair highlights the value of strategic investments in money-saving asset management tools and training,” said Martin Coghill, a senior manager for operations and maintenance at the Water Authority. “By proactively identifying this problem spot, we prevented what could have been a major unplanned shutdown.”

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The San Diego County Water Authority is proactively fixing a 90-inch diameter pipeline in Bonsall as part of the agency’s long-term commitment to maintaining regional investments in water supply reliability and affordability. Graphic: San Diego County Water Authority

Coordination, collaboration with member agencies

The Water Authority has been coordinating closely with retail water agencies in North County that rely on deliveries from Pipeline 4. Rainbow Municipal Water District, Fallbrook Public Utility District, City of Oceanside, Valley Center Municipal Water District, and Vallecitos Water District are preparing to continue water deliveries by other means to homes and businesses while Pipeline 4 is out of service.

Fortunately, while Pipeline 4 is shut down the Water Authority’s resilient system can deliver treated water to retail agency connections from multiple sources, including the Carlsbad Desalination Plant.

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Fortunately, while Pipeline 4 is shut down the Water Authority’s resilient system can deliver treated water to retail agency connections from multiple sources, including the Carlsbad Desalination Plant. Photo: San Diego County Water Authority

Water Authority infrastructure repairs are funded by water ratepayers countywide. Regional investments in supply reliability ensure consistent and timely monitoring, maintenance, and repairs of the complex countywide water delivery system. Those investments, in turn, support San Diego’s regional economy and quality of life.

The Water Authority operates and maintains a water delivery system capable of delivering more than 900 million gallons of water per day through 310 miles of large-diameter pipeline, 1,600 aqueduct-related structures, and approximately 100 metering/flow control facilities. It also includes a state-of-the-art water treatment plant, hydroelectric facilities, pump stations, flow regulatory structures, and reservoirs that store water for emergencies and dry years.

Proactive asset management saves ratepayers money

As assets age, the Water Authority proactively replaces and repairs them to minimize impacts to member agencies and the public. Investments in the latest inspection technologies, including electromagnetic scanning, robotic inspections and 3D tunnel inspections help the Water Authority’s asset management team detect defects in pipelines and related facilities. By identifying corrosion or other types of deficiencies early, potential problems are corrected so they don’t become large and more costly issues.

Approximately 82 miles of the Water Authority’s pipelines are pre-stressed concrete cylinder pipes, also known as PCCP, that are made from a combination of steel and concrete. However, numerous catastrophic failures have occurred with these pipes worldwide in recent decades. In response, the Water Authority instituted a proactive program in 1991 to reinforce the pipelines with steel liners. To date, the Water Authority has relined 47 miles of PCCP.

(Editor’s note: The Rainbow Municipal Water District, Fallbrook Public Utility District, City of Oceanside, Valley Center Municipal Water District, and Vallecitos Water District are five of the San Diego County Water Authority’s 24 member agencies that deliver water across the metropolitan San Diego region.)

North County Water Delivery System Repairs Start March 1 in Bonsall

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The San Diego County Water Authority is proactively fixing a 90-inch diameter pipeline in Bonsall as part of the agency’s long-term commitment to maintaining regional investments in water supply reliability and affordability.

Water Authority staff detected potential pipeline weaknesses just north of West Lilac Road in late January using real-time acoustic fiber-optic monitoring. This technology locates distressed sections of pipelines even while they are in use as part of the Water Authority’s high-tech asset management program.

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Otay Water District Invests in Preventive System Maintenance

/in , , /by /Water News Network

As part of its preventive maintenance program to safeguard its water supply and reduce water loss, the Otay Water District is conducting leak inspections of its pipeline system. Leak detection and repair programs save water by ensuring water system integrity. The District uses state-of-the-art equipment to inspect its water distribution system for leaks in pipelines, meters, and valves. The equipment is designed to “listen” for leaks and can pinpoint the location of even the smallest water leak. Once identified, crews will schedule the needed repairs.

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Water Authority Completes Pipeline 3 Relining in Mission Trails Regional Park

/in , , /by /Water News Network Quoted: San Diego County Water Authority

San Diego County Water Authority Operations and Maintenance staff recently completed a complex relining project on a section of Pipeline 3 in central San Diego, within Mission Trails Regional Park. Pipeline 3 traverses the western portion of the region from the Riverside County border in the north to Lower Otay Reservoir in the south. The proactive Pipeline 3 relining project is part of the asset management program to make preventative repairs to large-scale infrastructure.

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Worker relines water pipeline

Water Authority Completes Pipeline 3 Relining in Mission Trails Regional Park

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San Diego County Water Authority Operations and Maintenance staff recently completed a complex relining project on a section of Pipeline 3 in central San Diego, within Mission Trails Regional Park. Pipeline 3 traverses the western portion of the region from the Riverside County border in the north to Lower Otay Reservoir in the south.

Large-diameter pipelines operated by the Water Authority and its 24 member agencies extend approximately 310 miles to convey water throughout the region.

By relining pipes ahead of time or conducting timely repairs, the Water Authority and its member agencies avoid pipeline failures and improve the reliability of future water supplies. The proactive Pipeline 3 relining project is part of the asset management program to make preventative repairs to large-scale infrastructure.

Pipeline 3 Relining

In June 2020, O&M staff performed an inspection of Pipelines 3 and 4 within Mission Trails Park during a routine shutdown. They inspected an area of Pipeline 4 that had previously been repaired, and the repairs were found to have held up successfully. Pipeline 3 has similar characteristics to Pipeline 4 in that area, and during the shutdown, staff inspected and found a 32-foot section of pipeline that had sustained lining damage. Between August and September 2021, staff completed the complex repairs on Pipeline 3.

Operations and Maintenance teams collaborate, overcome challenges

“The project was challenging due to several geographical factors, including the distance of access structures from the damaged section and the steep grade of the hill that the section of pipeline traverses,” said David Hernandez, maintenance technician at the Water Authority. “Our asset management, facility maintenance, and mechanical maintenance teams collaborated closely to plan and execute the complex repairs.”

To begin the relining project, heavy concrete covers at access point structures were first removed to allow staff to access the pipeline. Piping and an air valve at the top and pumping well at the bottom of the hill were then removed to allow for safe access. Staff installed an atmospheric ventilation fan that moved fresh air into the pipeline. Once the piping and valves were removed, they were able to enter the pipeline.

Staff then hiked through the pipeline to perform a visual inspection and locate the damaged area. They located the broken lining section and loaded broken pieces into buckets and manually hauled the buckets to access structures. Then the metal pipeline was prepared for the application of new liner. Preparation of the pipe took several days – it involved carefully cutting out any remaining damaged liner, descaling rust from the metal, and cleaning up and wiping down the metal to prepare for new lining. O&M staff then mixed the new lining material – approximately 4,400 pounds of dry material was mixed and lifted over the course of the project. The new liner was then manually applied to the pipe, starting from the bottom half for traction and then applied up to the crown of the pipe. Finally, every inch of the new lining was carefully inspected.

Careful planning protects crews during critical repairs

The highly specialized work effort was performed in a safe and efficient manner due to careful planning and execution by the Water Authority’s O&M staff. Throughout the process, staff took multiple safety measures, including wearing personal protective equipment, having a confined space rescue team on standby, and tying hand and foot loops into a safety rope. The entire project took approximately one month. It will extend the lifetime of Pipeline 3, a crucial component to the region’s water supply.

Vallecitos Water District Taps Tech for Pipeline Inspection

/in , , /by /Water News Network Mentioned: San Diego County Water Authority

The Vallecitos Water District is using a specialized camera and sonar to evaluate the condition of a sewer pipeline between San Marcos and Carlsbad.

The Land Outfall West pipeline is a large sewer line that stretches from El Camino Real to the Encina Water Pollution Control Facility in Carlsbad. Originally installed in 1986, an evaluation of the pipeline’s current condition using closed-circuit TV (CCTV) cameras and sonar will help the District identify and prioritize its ongoing pipeline renewal and maintenance activities.

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Working with Hoch Consulting, the Vallecitos Water District inspection project will take place through June. Photo: Vallecitos Water Distict

Vallecitos Water District Taps Tech for Pipeline Inspection

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The Vallecitos Water District is using a specialized camera and sonar to evaluate the condition of a sewer pipeline between San Marcos and Carlsbad.

The Land Outfall West pipeline is a large sewer line that stretches from El Camino Real to the Encina Water Pollution Control Facility in Carlsbad. Originally installed in 1986, an evaluation of the pipeline’s current condition using closed-circuit TV (CCTV) cameras and sonar will help the District identify and prioritize its ongoing pipeline renewal and maintenance activities.

Inspections help ensure system reliability

Field teams begin the inspection process, which is taking place at night to minimize disruption. Photo: Vallecitos Water District

Field teams begin the inspection process, which is taking place at night to minimize disruption. Photo: Vallecitos Water District

The pipeline ranges in size from 24-inches to 54-inches in diameter and is approximately 3.2 miles long. Project Manager Susan Bowman said today’s technology allows the District to perform thorough inspections without digging up streets and disrupting neighborhoods.

“We want to make sure the pipeline is still in good shape,” explained Bowman, who is the District’s asset management supervisor. “We’re going to be taking a look at the inside of the pipe using an advanced CCTV tool. It looks at all of the insides of the pipeline and identifies any flaws or maintenance issues that may need to be addressed.”

Bowman said the District regularly inspects manholes and performs routine inspection activities. Using cameras and sonar will provide more detailed information to help the District plan ongoing maintenance and repair to ensure the pipeline will continue to perform well.

District staff, consulting staff, pipeline inspectors, and environmental inspectors will be onsite during the work. Work started at the east end of the pipeline in Carlsbad, and will follow along Palomar Airport Road under Interstate 5, and end at the Encina Wastewater Treatment Plant.

Cost-effective and less disruptive

Map showing the 3.2 mile stretch of Vallectios Water District pipeline undergoing inspection in June. Photo: Vallecitos Water Diatrict

Map showing the 3.2 mile stretch of Vallecitos Water District pipeline undergoing inspection in June. Photo: Vallecitos Water District

To minimize traffic impacts and to take advantage of lower flow levels, all work is scheduled at night between 9 p.m. and 6 a.m. and will occur on weekdays through June 18. Bowman said most of the work should have limited impact on businesses and residents in the area, with minor compressor noise and limited street blocking along Palomar Airport Road.

Pipeline inspections tap tech

“We want to be good neighbors,” said Bowman. “But it is critical to ensure a pipeline is performing well, it is safe, and it is able to continue to do its job. It’s a cost-effective way to ensure the District’s assets are performing well. The technologies have really improved in the last 15 to 20 years.”

Previously, the only way to inspect a pipeline was to take it out of service and dig it up.

“If you’re going to dig something up to see what shape it’s in, you might as well be replacing it,” said Bowman. “We are definitely looking at a lot of these different noninvasive type of technologies. It helps the system perform better by reducing unplanned emergencies which are disruptive to all of us.”

(Editor’s note: The Vallecitos Water District is one of the San Diego County Water Authority’s 24 member agencies that deliver water across the metropolitan San Diego region.)

An employee looks into a section of pipeline. One of the projects receiving an award.

Water Authority Wins Four Awards for Outstanding Projects

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The American Public Works Association and American Society of Civil Engineers recently presented the San Diego County Water Authority with four awards for construction projects that exemplified outstanding skill, dedication and collaboration from staff in many departments. All of the projects were underway or completed during the COVID-19 pandemic, and project teams navigated shutdowns, adapted to health and safety restrictions, and overcame many other uncertainties – in addition to typical challenges encountered during construction projects.

1) APWA Project of the Year: Northern First Aqueduct Structures and Lining Rehabilitation

With extensive coordination between the Water Authority’s Asset Management, Operations, Maintenance, Right of Way, Water Resources, Engineering and Public Affairs teams, the First Aqueduct rehabilitation project was completed in early 2021. Significant work had not been performed on the First Aqueduct since the completion of Pipeline 1 in 1947 and Pipeline 2 in 1954. The Operations and Maintenance Teams worked closely with multiple member agencies to ensure no impacts to water deliveries over the extended shutdowns required to reline both Pipelines. These extended shutdowns allowed the Asset Management team to inspect 27 miles of pipeline along the aqueduct using innovative technologies – the first time this had been done in nearly 75 years.

“Since the project included more than 35 work sites spread out over 15 miles, many in rural areas of the county, we collaborated closely between different departments and member agencies to ensure that water service was not disrupted,” said Emma Ward-McNally, Water Authority engineer.

2) APWA Honor Award: Vallecitos 11/Vista Irrigation 12 Flow Control Facility

This new facility replaced the existing Vallecitos 2/Vista Irrigation 1 facility that was built in 1954. The Water Authority’s Operations and Maintenance team worked closely with the Engineering team to develop a construction sequence to build the new facility while maintaining water service to member agencies.

“A meticulous level of detail in the design process allowed for the project to be completed with minimal changes during construction,” said Jim Zhou, Water Authority senior engineer.

3) APWA Honor Award: San Diego 28 Flow Control Facility

The new flow control facility replaced the San Diego 12 flow control facility. The Water Authority’s Right of Way team worked closely with the City of San Diego to acquire property rights for the facility. During construction, electrical and rotating technicians from Operations and Maintenance provided support to ensure that the facility was constructed correctly and that electrical relay protection was coordinated when connecting to San Diego Gas & Electric.

“The new facility repurposed an existing building at the site, but it was forward-looking – the project included the installation of a second pipe train for a future inline hydroelectric turbine,” said Aaron Trimm, Water Authority senior engineer.

4) ASCE Award of Excellence: Pipeline 5 Emergency Repair

After nearby Pipeline 4 was repaired in late 2019, the Asset Management team inspected Pipeline 5 in early 2020, and found it needed repairs as well. Multiple Water Authority departments and teams collaborated to launch the emergency repairs on Pipeline 5, despite the uncertainty of the growing pandemic. The Engineering Contracts group executed five contracts and task authorizations for design, construction and inspection within a few weeks to make the project happen, and the work was completed in April 2020.

“The project was a true team effort that required collaboration from multiple departments to ensure that the emergency repair could be completed even as the region was shutting down due to the pandemic,” said Colin Kemper, Water Authority senior engineer.