Project overview

The Waimea Community Dam is a 53 m-high concrete face rockfill dam (CFRD) located on the Lee River, in the Tasman District.

The dam is a multipurpose water storage providing managed release of water into the Waimea River for environmental release, water supply, aquifer recharge and irrigation.

Tonkin + Taylor has been involved in this project since the early 2000s and provided specialist dam engineering and consultancy services from pre-feasibility to detailed design. This included Stage 1 (Concept verification), Stage 2 (Contractual and Procurement Strategy), Stage 3 (Design to support resource consent), and Stage 4 (Detailed design to construction level).

Our role in this project has embraced work for several clients under two separate ECl and value engineering processes. This included partnering with international CFRD experts, the ECI contractor and engaging WSP-Opus as Mechanical & Electrical (M&E) engineering sub-consultant.

Services Continued:

  • Mapping of defect orientations with stereographic plots of defects for kinematic stability assessments.
  • Detailed interpretative geotechnical reporting.
  • Concept scoping and prefeasibility studies including site selection, feasibility studies and inputs into construction cost estimation and methodology with the support of Fletcher Construction (as part of Stage 3), and FHTJV (as part of Stage 4).
  • Procurement strategy advice.
  • Design and specialist advice to support resource consent application (Stage 3).
  • Detailed design and construction issue documentation (Stages 3 and 4).

Services

  • Specification and management of site investigations including engineering geological mapping, seismic refraction surveys, track cutting and logging, test pitting, trench excavation and logging.
  • Vertical and inclined machine boreholes, including continuous Lugeon (packer testing) in select boreholes, in situ testing, and permeability testing.
  • Laboratory testing including: PSD, LA Abrasion Test, Crushing Resistance, Sand Equivalent, Petrographic Analysis to determine the chemical weathering and suitability of material for use as concrete aggregate, shear strength testing, point load tests, unconfined compression tests, and triaxial tests on a range of samples.
  • Rock mass strength estimates including RMR and GSI rock mass classification, and drill core RQD.
  • Detailed geological and geomorphological mapping.
  • Field compaction trials.

Client

  • Tasman District Council (TDC)

  • Waimea Water Augmentation Committee (WWAC)

Year

  • 2019

  • Dam completed in 2024

Key Design Features

The Waimea Community Dam is classified as High Potential Impact Category (PIC). It consists of a 53 m-high, 220 m-long concrete-faced rockfill embankment founded on greywacke. The design includes a concrete-lined spillway with a capacity of 1,150 m³/s and twin diversion culverts. The reservoir impounds a storage volume of 13 Mm³ at Normal Top Water Level (NTWL).

Waimea

Additional Studies

Tonkin + Taylor also undertook pre-feasibility engineering, environmental and economic assessments for multiple sites and options, hydrological and yield modelling, geological model development, and fish passage design to support resource consent. Feasibility design for a hydroelectric power add-on was also completed.

Independent reviews were carried out by Cawthron, Waterways, and the Department of Conservation (DOC) to ensure compliance and environmental stewardship.

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