Water
Project
A 5.5-mile immersed-tube rock tunnel carrying drinking water across the bay.
Design and construction support for a landmark underwater water-supply tunnel.
The tunnel crossed a busy navigation channel in seismically active ground, combining a pressure tunnel with a shore-based shaft and valve complex. Our engineers supported the design through construction, including cover and internal pressure checks, joint design and commissioning.
Scope of work
- Tunnels & Underground Engineering
- Geotechnical Engineering
- Construction Management
Project facts
- Length
- 5.5 miles
- Type
- Immersed tube
- Carries
- Drinking water
- Completion
- 2014
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