Waimea Community Dam

30 November 2021

The Waimea Community Dam, currently under construction, is the largest dam built in New Zealand for over 20 years at a cost of more than $160m. Holcim is committed to providing the highest quality products and service to our customer on the project, Allied Concrete.

dowstream view looking upstream scaled
Downstream view, looking upstream, September 2021.

We are supplying GP Cement and Fly Ash to this once-in-a-generation construction. Once complete, the dam will:

  • Secure the Tasman region's water supply for the next 100 years
  • Improve water quality to provide a better environment for people, plants, fish and animals
  • Strengthen the economy through the success of primary industries and the subsequent growth of associated secondary and tertiary industries
  • Provide an estimated economic benefit to the Tasman region of $600-900m in the first 25 years.

Allied Concrete is supplying concrete that includes fly ash (as a partial cement substitute) to reduce the heat generated during a large mass concrete pour. The added benefit from using fly ash as a partial cement replacement is the resulting lower embodied carbon of the concrete produced.

The carbon reduction achieved by using 30% fly ash in the concrete mix, is partly negated by other admixtures used in the concrete. As a result, the overall carbon reduction is lowered to 6%.

The project is due for commission in late 2022.

Images: Courtesy of Waimea Water and Daniel Sinoca on Unsplash.