Just like our bodies require routine health screenings and checkups with age, so does our aging water infrastructure. The Santa Clara Valley Water District has been busy inspecting and maintaining our county’s aging water infrastructure, and in some cases making needed upgrades.
The water district is responsible for the operation and maintenance of 142 miles of pipelines that transport water from reservoirs to its treatment plants, and from its treatment plants to water retailer distribution systems. Through our network of massive pipes (some as wide as 10 feet in diameter), over 121 billion gallons of water travel annually from their source to groundwater replenishment ponds throughout the county and, ultimately, to your tap.
For most people, pipeline maintenance isn’t a topic at the forefront of our water concerns. However, the majority of our pipelines are over 30 years old. Because they are underground, it becomes easy to forget about them—an “out of sight, out of mind” perspective. For the water district, it is important to perform routine inspections to ensure proper operation and to detect any repair needs, which helps avert a potential pipeline failure that could cause serious damage and disrupt water service.
The water district maintains and inspects some of its pipelines on a 10-year inspection cycle to detect signs of corrosion, weak spots or leaking. Some of the more critical pipelines require a maintenance and inspection cycle every five years.
The water district visually inspects pipelines, but also uses modern technologies to enhance the quality of diagnosis and to identify any signs of pipe distress quickly. Recently we used a high-tech sensor held in a floating foam ball that traveled through several miles of pipeline to literally listen for leaks. Another device we are using is acoustic fiber optic cables that monitor breaks in the wires that keep concrete pipes intact, and can provide instant status reports.
Regular inspections are also a cost-saving measure; it is much more expensive to deal with the consequences of pipe failure than to invest in regular maintenance.
Scheduling inspections and repairs for so many miles of pipe is a major challenge since we all depend on them for our water supply. Many key pipelines can only be taken out of service for short periods of time without affecting water supply availability.
Another major pipeline project that started this fall will install large flexible pipelines that deliver water to the Penitencia Water Treatment Plant and connect to water distribution systems. The pipes are made to withstand movement from landslides or earthquakes registering a 6.0 magnitude, to prevent future pipe failures. This is the first project of its kind for the water district.
Identifying warning signs also helps avoid wasting water through pipe leaks. As we do our part, we encourage residents to check for leaks at home in both indoor plumbing and outdoor irrigation systems, and repair them. Taking action now helps avoid future losses.
For more information on upcoming pipeline projects, water supply, flood protection, board updates and more, sign up for our monthly newsletter on valleywater.org.
John Varela sits on the Santa Clara Valley Water District Board of Directors, representing the district that includes South County. For further information, contact Varela at jv*****@va*********.org.
