Project goal:

To expand the Groundwater Replenishment Scheme

Status:

Commissioning

Delivery Date:

Early 2022

What's happening?

We're rolling out Stage 2 of the Groundwater Replenishment Scheme, which will double our recharge capacity and further help to secure drinking water for Perth.

The expansion includes:

  • build a second Advanced Water Recycling Plant at the Beenyup facility in Craigie
  • drill four new recharge bores and four new monitoring bores in Wanneroo and Neerabup
  • build a 13km recharge pipeline connecting the Advanced Water Recycling Plant with the new bores.

Where is this happening?

The second Advanced Water Recycling Plant is located next to the original plant at our Beenyup facility in Craigie with the two sharing some infrastructure. 

Below is a map showing the Beenyup facility location, pipeline route and recharge bore sites.

 Pipeline route   Beenyup site   Recharge site  

Why is this work taking place?

Due the impacts of climate change on Perth, a decision was made in July 2016 to expand our Groundwater Replenishment Scheme. This Scheme provides a new climate-independent water source to boost much needed drinking water supplies in Perth.

The expansion will provide better certainty for Perth's water supplies.

When is this happening?

The Stage 2 expansion infrastructure has been constructed and is currently being commissioned and tested. Stage 2 is expected to become fully operational in 2022.

Construction of the new Advanced Water Recycling Plant started in late-2017 and was completed in late-2019. The new offsite recharge and monitoring bores were drilled between late-2017 and early-2018 with the above-ground bore infrastructure constructed in 2019. The pipeline was constructed in sections from early-2018 to mid-2019.

How will this impact the community?

The construction of Stage 2 infrastructure is now complete. We thank the community for their patience and understanding during construction.

We are currently commissioning and testing Stage 2 before it becomes fully operational in 2022. We don’t anticipate any impacts to the community during this time.

Why is this work taking place?

As Perth continues to experience the impacts of climate change, the decision was made in July 2016 to expand our Groundwater Replenishment Scheme.
This will provide better certainty for Perth's water supplies.

How were the recharge sites selected?

 We worked closely with the Department of Water and Environmental Regulation to identify locations suitable to recharge this drinking-quality recycled water, with the final sites selected at the pine plantation in Wanneroo and at a site further north in Neerabup.

How were the recharge bores constructed?

Two recharge bores and two monitoring bores were constructed and tested at each recharge site, totalling eight Stage 2 bores. The work included site preparation and geotechnical surveys, drilling and casing to depths of up to 1,400 metres, and installation of the above-ground bore infrastructure. This included a recharge pump building, switch room building, balance tank, high voltage metering unit, switchgear and transformers, and an emergency overflow sump at each site.

How was the pipeline route selected?

The pipeline transfers water from the Advanced Water Recycling Plant in Craigie to the two off-site recharge sites in Wanneroo and Neerabup, so its ideal route was determined to be along the eastern side of Lake Joondalup. The final pipeline route was selected in consultation with other government departments, taking into account impacts to the community and the environment, safety, constructability and cost.

How was the pipeline constructed?

The majority of the pipeline was constructed using open-trenching techniques, which involved excavating a trench and laying lengths of pipe up to 2m below the surface, backfilling the excavation, and then reinstating the surface including roads and parklands. We used trenchless techniques to install the pipeline under major roads and environmentally-sensitive areas.