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Barnard replaced 10,000 LF of penstock along the Los Angeles Aqueduct system, which carries water from the Owens Valley to the greater Los Angeles area.

Originally constructed in the 1920s, the penstock for the Haiwee Power Plant has been updated on several occasions throughout its operations. In the 1980s, 1,700 feet of penstock collapsed due to a vacuum event, which was partially restored from pressure inflation but left with many creases, folds, and other distortions in the structure. For this project, Barnard replaced the distorted 102-inch welded and riveted steel penstock with new 84-inch double O-ring bell and spigot carbon fiber reinforced polymer (FRP) pipe. The new penstock can withstand normal operating pressure changes while accommodating surges and full vacuum conditions from emergency unit shutdowns and other system upsets.


Location: Olancha, California

Owner: Los Angeles Department of Water and Power (LADWP)

Engineer: Golder Associates

Construction Manager: Black & Veatch

Contract Type: Engineer, Procure, Construct (EPC)

Status: Complete


  • 2020 Construction Risk Partners Build America Award, Utility Infrastructure Renovation
  • 2019 ENR Best of the Best Projects in Water/Environment
  • 2019 ENR California Best Project in Water/Environment, Southern California
  • Installation of fire hydrants, gravity drain blowoff, and air/vac valves
  • Installation of 10,000 SF of full vacuum compatible FRP lining in existing penstock sections
  • Installation of steel manway

10,000 LF frp penstock

70,000 CY trench excavations

21,000 CY clsm pipe backfill

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