Our team is expert in the investigation, design,

consenting, construction supervision, safety

management, regulatory review, surveillance,

through to decommissioning of dams and ancillary

infrastructure, such as power stations, spillways,

penstocks, bridges, inlet structures, tunnels

and roads.

In an evolving context of natural hazards, climate

change, and regulations, we provide owners and

developers with solutions with diverse benefits, while

also allowing them to plan for, and efficiently manage,

the risks inherent in water detention structures.

Our team relishes working with others. Our engineers,

scientists and planners bring specialist and

supplementary expertise to collaborative projects,

such as stakeholder engagement, fish passage, water

quality modelling, liquefaction, arch dam analysis, and

seismic hazard assessments.

ExpertiseOur specialist services include:

Conceptual design and feasibility studies

• Project definition and value engineering

• Geotechnical investigations and assessments

• Hydrological and flood hazard studies

• Dambreak hazard and Potential Impact Classification

• Dam engineering

• Environmental assessment.

Dam engineering

Consents

• Compliance with environmental legislation

• Assessment of environmental effects

• Presentation of evidence

• Consent renewals

• Building consents

• Stakeholder engagement.

Dam design and documentation

• Failure Mode and Effects Analysis (FMEA)

• Detailed design and documentation

• Design review during construction

• Commissioning

• Dam safety Management Systems

• Operation, maintenance and surveillance manuals

• Emergency action plan.

Construction management

• Senior management (both Engineer to the Contract

and Resident Engineer)

• Site supervision

• Dam safety management

• Surveillance, monitoring and evaluations

• Safety reviews

• Risk-based frameworks and tools

• Asset valuation

• Instrumentation and calibration

• Dam rehabilitation and upgrading investigations

• Peer review and expert witness.

ExperienceTonkin + Taylor (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.

New Zealand projects include:Stuart Macaskill Lakes, Upper Hutt

Design and construction monitoring for seismic and

seepage control upgrades.

Waimea Community 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.

Whau Valley Dam

Design of primary water supply dam for Whangarei

District Council. In 2019, Whau Valley Dam Celebrated

50 years since commissioning. T+T undertake ongoing

dam safety audits.

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 40 m 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.

Any questions you can email us here:

dams@tonkintaylor.co.nz

Key Project ContactsDewi Knappstein (Auckland) (NZSOLD Young

Professionals Co-chair, Business Leader Dams)

Tim Morris (Canterbury, Otago, Southland, Westland)

(Technical Director Dams)

David Bouma (Waikato, and wider New Zealand)

(NZSOLD Management Committee, ICOLD Technical

Committee on Levees)

Vicki-Ann Dimas (Melbourne, Australia)

Paul McCallum (Auckland, and wider North Island)

David Leong (Auckland, Northland)

Lance Partner (Bay of Plenty)

Bryn Quilter (Waikato)

Casey Giberson (Waikato)

Tung Hoang (Wellington)

Neville Laverack (Nelson, Tasman, Marlborough)

Dominic Fletcher (Canterbury, Otago, Southland,

Westland)