Dam Engineering

We provide a full range of services for clients requiring dam engineering, upgrade and safety management.


Services we typically offer include:

  • Conceptual design and feasibility studies

- Project definition and value engineering

- Geotechnical investigations and assessments
- Hydrological and flood hazard studies

- Dam engineering

- Cost estimation and project scheduling

- Environmental assessment

  • Consents

- Compliance with environmental legislation
- Assessment of environmental effects

- Presentation of evidence

- Consent renewals

- Building consents

  • Dam design and documentation

-  Detailed design and documentation
-  Costing and programming
-  Design review during construction
-  Commissioning
-  Operation, maintenance and surveillance manuals
-  Emergency action planning

  • Construction management

-  Senior management (both Engineer to the Contract and Resident Engineer)
-  Site supervision
-  Cost and timeline programming

  • Dam safety management

- Surveillance, monitoring and evaluations
- Safety reviews

- Risk analysis

- Asset valuation

- Instrumentation and calibration

  • Dam rehabilitation and upgrading investigations
  • Peer review and expert witness


T+T has designed 17 dams in the ICOLD large dam category, with all constructed and operating. We have designed many smaller, yet significant dams (including head ponds) which have been built. Our specialist team has completed over 50 dam safety reviews, dam rehabilitation and upgrade projects.

Our recent New Zealand projects include:

  • Stuart Macaskill Lakes, Upper Hutt 

Design and construction monitoring for seismic and seepage control upgrades 

  • Lee Valley Dam, Tasman District

Concept development through to detailed design for the 53m high concrete faced rockfill dam and appurtenant structures

  • Wairarapa Water Use Project, Wairarapa

Pre-feasibility and feasibility study of options for storage and optimal use of water resources for the Wairarapa

  • Ruataniwha Water Storage Scheme, Hawke’s Bay

Project scoping and options studies; pre-feasibility
and feasibility studies; geotechnical site investigations into providing irrigation water and consent support for the scheme

  • Waipori Dam Structural Assessment, Lake Mahinerangi, Otago 

Geological and geotechnical investigations and structural assessment of this combined concrete gravity and arch dam

  • Lake Rochfort Hydro Project, Westport

Design and construction observation for rockfill dam and penstock intake structure.

Our recent International projects include:

  • Dam safety panel for the design through construction of the 520 MW Huoi Quang project in Vietnam
  • Review consultant through feasibility and into procurement for the 40m high concrete faced rockfill dam Tina River hydropower project, Solomon Islands
  • Sibulan hydroelectric scheme (42 MW) design and construction supervision in Mindanao, Philippines
  • Ambuklao and Binga hydropower schemes sedimentation management studies
  • Detailed design for the 13 MW, two station Tudaya Hydro Power Project in Southern Mindanao, Philippines
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