WaterBay Tunnel
A 5.5-mile immersed-tube rock tunnel carrying drinking water across the San Francisco Bay.
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Trenchless Engineering
Consulting services for small-diameter tunnels and trenchless technologies.
From preliminary and final design to construction support, our trenchless technology experts provide comprehensive services for complex projects. We are recognised throughout the trenchless industry, and our engineers regularly guest-lecture at seminars and publish technical papers on the latest advances.
We understand the full range of small-diameter tunnelling and trenchless technologies available to complete your project successfully — and, just as importantly, we know when a trenchless solution is the wrong answer for the ground you have.
Technologies
- Microtunnelling
- Pipe jacking
- Horizontal directional drilling (HDD)
- Direct Pipe
- Auger boring
- Pilot tube guided methods
- Pipe bursting
- Pipe ramming
- Direct steerable pipe thrusting
- Utility tunnelling
What we provide
- Technology selection and feasibility
- Preliminary and final design
- Ground conditioning and shaft design
- Jacking pipe and lubrication design
- Construction support and site support
- Construction risk assessment
- As-built record drawings and data
Why it matters
- Minimises surface disruption in congested urban corridors
- Reduces open-cut excavation risk over live utilities
- Shortens programme compared with open-cut
- Lower carbon footprint through reduced spoil and traffic
- Fewer community and traffic impacts
Projects using Trenchless Engineering.
WaterBay Tunnel project details
WaterMountain Tunnel Improvements
Rehabilitation of a century-old bedrock water-supply tunnel serving a major California system.
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WaterNew Irvington Tunnel
A 3.6-mile steel-lined pressure tunnel and two large-diameter shafts in the Hayward Fault zone.
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WaterRondout-West Branch Bypass Tunnel
A deep rock pressure tunnel bypassing an ageing aqueduct, including a 1,100-foot drop shaft.
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WaterSan Vicente Tunnel
A 15-mile, high-pressure conveyance pipeline, a landmark in seismic-resilient design.
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WaterWillamette Water Supply Program
18 miles of high-pressure tunnel, plus shafts, reservoirs and a treatment-plant connection.
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We rarely work in only one discipline.
Tunnels & Underground Engineering
From feasibility studies to detailed design, to engineering and management services during construction.
Tunnel Inspection & Rehabilitation
Inspection and rehabilitation services that improve the safety, functionality and longevity of underground structures.
Advisory Consulting
Our consulting services go deeper than design — we advise at every stage of project development.
Engineering Consulting
Multi-disciplinary engineering, analysis and digital delivery for complex underground assets.
Construction Management
Good construction management paves the way for safe, efficient project execution.
Construction Claims Services
Contractual clarity from notice to resolution, supported by forensic engineering.
Talk to the engineers who do the work.
Every enquiry is reviewed by a principal engineer in the relevant practice — not a sales team. If your question is a technical one, you will get a technical answer, and if we are not the right firm for the job, we will say so.
Or email us directly at support@hoffmantunnels.com.
