WastewaterCentral Interceptor
A 15-kilometre gravity trunk sewer and pump station network reducing overflows across central Auckland.
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Wastewater Market
Efficient and affordable design and construction management services for wastewater conveyance facilities. Since the late 1980s we have played a crucial role in significant clean water infrastructure projects across North America, New Zealand, and Australia.
Combined Sewer Overflow (CSO)
Our engineers have practical experience that includes numerous CSO projects. For consent decree driven CSO programs, we strategically balance innovative technologies and practical designs to meet their often-tight schedules and limited budgets.
Sanitary Sewers
Our underground sewer conveyance experience ranges from large-diameter interceptor sewers to smaller-diameter force mains and trunk sewers. We offer a full range of design and construction management capabilities for conventional open-cut excavation and various trenchless technologies.
Our subject matter experts understand the unique challenges of sewer design and construction, including durability and corrosion considerations and hydraulic functional design and performance.
Stormwater & Flood Mitigation
We take into consideration resiliency and changing climates when we design underground stormwater infrastructure for governments, agencies, and contractors to meet the challenge of stormwater conveyance and flood mitigation.
We also offer the full range of construction management capabilities for conventional open-cut excavation, trenchless technologies, and large-diameter tunneling for stormwater projects. The scope of our experience varies from culvert crossings to larger diameter tunnels capable of managing flows up to 500-year storms.
Odor & Corrosion Control
Sewer tunnels live or die on their air. We design ventilation, corrosion allowance, and lining systems together rather than treating them as later add-ons, and we test the flow conditions that actually drive odour at the drop shaft.
For long-term storage tunnels we address hydrogen sulphide attack, joint detailing, and the washout risks that only show up after a decade of operation.
Wastewater Market in practice.
WastewaterCentral Interceptor project details
WastewaterBrightwater Conveyance System
A regional conveyance system including a long single-pass microtunneled marine outfall connector.
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WastewaterNorthwest Inner City Upper Plateau Separation Project
A deep trunk sewer and drop shaft re-routing combined flows away from an overloaded waterfront interceptor.
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WastewaterAkron Ohio Canal Interceptor Tunnel
A deep, small-diameter interceptor tunnel and consolidation tank system in karstic ground.
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WastewaterAnnacis Island Outfall System
A trenchless outfall and marine diffuser replacement delivered with the plant kept in service.
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WastewaterGolden Ears Force Main and River Crossing
A large-diameter force main including a difficult river crossing and deep urban shafts.
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How we serve wastewater market.
Tunnels & Underground Engineering
From feasibility studies to detailed design, to engineering and management services during construction.
Trenchless Engineering
Consulting services for small-diameter tunnels and trenchless technologies.
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.
Other markets.
Transportation Market
Responsive and comprehensive solutions to highway, freight rail, and mass transit and commuter rail clients. W…
Water Market
Since our founding we have been at the forefront of providing cost-effective, practical, and innovative engine…
Energy & Mining
From our first energy projects to current major efforts, we have built a reputation for developing practical a…
Talk to the wastewater market team.
Every enquiry is reviewed by a principal engineer in the relevant market — 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.