Presentation on theme: "The Regional Water Supply Strategy Securing water supply for the townships of Quirindi, Werris Creek and Willow Tree."— Presentation transcript:
The Regional Water Supply Strategy Securing water supply for the townships of Quirindi, Werris Creek and Willow Tree
The Current Situation Liverpool Plains Shire Council LGA Within the Namoi Valley, 470 kms NW of Sydney Services townships of Quirindi, Werris Creek, Wallabadah, Willow Tree, Spring Ridge, Premer, Blackville and Caroona Area of 5005 square kms and a combined population of 8,000 Business and employment is dominated by agriculture and mining.
Current Water Supply Quirindi and Willow Tree supplied from Upper Namoi Alluvial Groundwater Aquifer via a simple treatment plant. Werris Creek is supplied from Quipolly Dam via a water treatment plant in the town. Each township has a single source of water only Water consumption in 2012: Quirindi – 580 ML/annum Werris Creek – 250 ML/annum Willow Tree – 55 ML/annum The Current Situation
Constraints of Current Water Supply – a dichotomy Single source = no backup in the event of contamination, scarcity. Aquifers are dependent on short term stream flows and favourable climate. Aquifer groundwater levels in long term decline – not sustainable (McNeilage, 2006) In , township of Willow Tree almost ran dry (Level 7 restrictions were imposed). Water supply in Wallabadah failed requiring emergency cartage. In 2009, Werris Creek Lvl 4 restrictions – insufficient WTP capacity. The Current Situation Quipolly Dam has enough capacity to supply all townships, but is only connected to Werris Creek.
Predicted Impact on Water Security Water availability is predicted to decrease by 5% by 2030 (CSIRO Sustainable Yields Report for the Namoi Valley ) Average annual temperature will go up by 3 o C by 2050 Rainfall to become more variable (longer droughts, more intense periods of rainfall) Average runoff predicted to decrease by 7% by Likely to intensify after Climate Change
Risks Assessed High to extreme risks associated with short and long term water supply security during dry periods High to extreme risks associated with capacity of water treatment and storage infrastructure. Pressures from growth being realised already. High to extreme risk to supply security caused by reliance on a single water source. No options if source is contaminated or depleted. High to extreme risk associated with reliability of water supply infrastructure. External impacts such as electricity supply interruptions expected to increase. High risk of climate change impacts Significant structural pressures – particularly in the next 5 years Infrastructure funding constraints. Revenue base insufficient to meet immediate funding requirements. Low adaptive capacity to water security risks.
Mining related growth – indirect impacts Independent social impact reviews determine new jobs in the Liverpool Plains and Gunnedah LGAs BHP Billiton estimates new employees in Caroona Mine. Shenhua Watermark mine similar at Breeza. Even more during construction phase. Multiplier effect from supporting industries. MAC Worker Village – DA approved for miners village - equivalent to 525 dwellings (1500 miners) in Werris Creek, effectively doubling the population of the township Opportunity to Grow & Improve
Issues with water supply in the future WSAA specifies that to minimise risk of loss of supply, a minimum of 24 hours water storage should exist. Ratios are relative to this standard. Water – Essential to Growth Werris Creek WTP will not have sufficient capacity in 2015/16 and will be able to supply only half the demand in 2030
Issues with water supply to 2030 Willow Tree has less than 1 day’s storage at 2014/15 and will have 15 hours of storage at No room for system failure or power outage. System lacks the capacity to deal with water source contamination events System lacks capacity to deal with a growing incidence of extreme weather events: Insufficient water treatment capacity No diversification of supply No redundancy of supply Inadequate storage capacity in the system Water – Essential to Growth
The Regional Water Supply Strategy Works completed New 5ML reservoir in Quirindi, Safety upgrade and storage augmentation of Quipolly Dam Component 1 New 10 ML/day Water Treatment Plant, raw water pump station and treated water pump station 150kW, new pipeline to Werris Creek New main from WTP to Quirindi, alterations to pump equipment Quirindi Component 2 New main supplying Willow Tree from Quirindi, pump station for water transfers regionally and a new balance tank at Willow Tree
The Regional Water Supply Strategy Benefits of the Regional Water Supply Strategy An integrated water supply will provide 2 sources of water (surface water and groundwater) to all townships. A new water treatment plant will provide adequate supply to facilitate growth in Werris Creek to Expandable beyond A new water treatment plant will include capability to manage water quality events from Quipolly Dam, improving water supply security. Address water security issues and reservoir capacity issues to 2050 at Willow Tree. Provide more redundancy for system failures and extreme weather events. Expandable to other supplies if required
The Regional Water Supply Strategy Strategic Roadmap - Development We are here
The Regional Water Supply Strategy Capital Cost Stage No.ActivityCapital cost ($million) Completed 5 ML reservoir in Quirindi, safety upgrade and augmentation of Quipolly Dam (5.2GL to 8GL) $7.3m Complete Component 1 New 10 ML/day WTP raw water pump station augmentation and treated water pump station 150kW, new main to Werris Creek, New main from WTP to Quirindi, pump station alterations in Qdi $24.8m Component 2 New main supplying Willow Tree from Quirindi, pump station for water transfers regionally and a new balance tank at Willow Tree $2.4m RWSS Capital Cost Components 1 and 2 (remaining stages)$27.2m Cost estimates include allowance for contingencies and engineering ( in 2013/14 dollars)
Regional Water Supply Strategy – Merit Criteria Assessed Value for money. Levelised cost $0.32/kL (based on whole of life Capex and Opex in 2013/14 7% discount rate) Significant contribution to water security. Technically feasible and low risk operation. No negative environmental or social impacts. Fosters regional growth & prosperity. Improved level of service to consumers.