Derwent Park Stormwater Re-use Scheme – Aquifer Storage and Recovery (ASR)

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Glenorchy City Council (GCC) faced the challenge of storing stormwater captured for re-use as industrial and irrigation supply. Due to the urbanised nature of the area, limited surface water storage opportunities existed.

The council appointed GHD to advise on suitable options. Our team began by identifying a potential aquifer in a sand and basalt-filled palaeo-channel of the Derwent River. We then designed and carried out a geophysical, drilling, testing and modelling program, which confirmed the presence of the aquifer and identified extraction yields of up to 30L/s per bore. The team designed a bore network and injection/extraction schedule to optimise limitations of the available reticulation system, site access and the aquifer variability. We also provided water quality input and output requirements to the council’s treatment plant design team.

GHD worked with GCC and the state regulators to adopt the National Managed Aquifer Recharge (MAR) management framework and provided the environmental assessment and water management documentation required for approval. This included impacts on surface water flows in nearby streams and potential for drawing contaminated or saline groundwater.

Our team carried out geotechnical investigations in unconsolidated palaeo-channel sediments, to confirm acceptable drawdown limits, while minimising the risk of subsidence.

We also trained GCC staff to continue the groundwater level and quality monitoring required to ensure the systems continued operation and to meet legislative reporting requirements.

The completed project has provided a sustainable groundwater supply, which has enabled GCC to meet their water supply commitments during periods where there is no stormwater flow. The injection system allows GCC to replenish the water in the aquifer and improve groundwater quality by managed aquifer recharge (MAR) with treated stormwater during periods of excess stormwater supply.

As the first MAR/ASR project in Tasmania, this stormwater re-use scheme has enabled GCC to develop and operate an unused groundwater resource in a sustainable way.

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Our reliance on the ecosystem services provided by marine, freshwater and estuarine environments demands a proactive approach to our sustainable use of these assets.

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With you, our hydrogeologists work alongside our engineers, environmental consultants, planners, surveyors and GIS consultants to arrive at integrated solutions.

GHD has global hydrogeological experience in groundwater resource assessment, aquifer storage and recovery (ASR), mine dewatering, aquifer depressurisation, groundwater management and environmental assessment, salinity, acid sulfate soils (ASS) and acid and metalliferous drainage (AMD).

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All untreated water sources have unique water quality characteristics. So we’ve assembled a team with extensive practical experience in water treatment covering chemistry, biology, hydraulics, process selection, control, residuals handling and plant layout.

Our track record includes plant capacities of 0.1 MLD to over 2500 MLD. We’ve dedicated our efforts to more than 300 treatment plants over the past 60 years. Our services include design of water treatment process solutions as diverse as Dissolved Air Floatation Filtration (DAFF), Ozone/Biological Filtration and Desalination (using Reverse Osmosis or Electrodialysis Reversal).

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