One-of-a-kind 77-ton slip joint to ensure future water reliability for the Bay Area

Fremont, Calif. — A new kind of technology has arrived to help the Bay Area’s water system survive the next big one. This one-of-a-kind seismic slip joint sits on top of three major traces of the active Hayward Fault and can compress up to 6.5 feet when the earth begins to move, so that the water lifeline to 2.6 million water users in Bay Area doesn’t break.

It has been over 140 years since the last major earthquake on the Hayward Fault, and geologists now consider this fault to be at risk for another major earthquake in the near future. “It is just a matter of time before the next major earthquake hits the San Francisco Bay Area,” said the Water System Improvement Program Director Dan Wade. “We are literally in a race against time to safely rehabilitate and upgrade our extensive water infrastructure.”

The slip joint was specially manufactured in Texas for one trace of the Hayward fault. It will work as a system with two specially constructed ball joints and a concrete articulated vault to protect the Bay Division No. 3 water pipeline.

Construction will continue in Fremont through early 2015 in order to connect the new high-tech pipeline to the regional water system and to restore the roadways and landscape above the pipeline. This project is part of the $4.6 billion Water System Improvement Program to repair, replace and retrofit the Hetch Hetchy Regional Water System. The 82 projects stretching from the Central Valley into San Francisco are more than 80 percent complete.

To learn more about the construction project, visit www.sfwater.org/seismicupgrade.