ACTEW Submission to Legislative Assembly Inquiry Into Ecological
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INQUIRY INTO ECOLOGICAL CARRYING CAPACITY OF THE ACT Legislative Assembly Standing Committee On Climate Change, Environment And Water. November 2010 ACTEW Corporation Ltd. GPO Box 366 Canberra ACT 2601 ACTEW Submission to Inquiry into Ecological Carrying Capacity of the ACT and Region 1 Table of Contents 1 Introduction – ACTEW and its submission ..................................................................... 4 2 Background ....................................................................................................................... 6 3 Water Available to the ACT............................................................................................... 7 3.1 Constraints on potable water supply........................................................................................ 9 3.2 Climate impact on water availability..................................................................................... 10 3.2.1 Climate variability 10 3.2.2 Climate change 10 3.3 Water reuse as an alternate supply......................................................................................... 12 3.4 Other alternative supply options ............................................................................................ 14 3.5 Conclusion –Availability of Potable water supply for Canberra ........................................... 15 4 Ecological Footprint........................................................................................................ 16 4.1 Potential Footprint Issues....................................................................................................... 16 4.2 Footprint 1 – Volume of Water Abstracted ........................................................................... 16 4.3 Footprint 2 – Net Volume of Water Abstracted..................................................................... 17 4.4 Footprint 3 – Storage Dams ................................................................................................... 17 4.5 Footprint 4 – River Flow Patterns.......................................................................................... 18 4.6 Footprint 5 – Aquatic Ecosystems ......................................................................................... 19 5 Carrying Capacity............................................................................................................ 20 5.1 Future Potable Water Demand............................................................................................... 20 5.2 Carrying Capacity.................................................................................................................. 21 6 Current Levels of Potable Water use ............................................................................. 22 6.1 Current Levels of Resource Use – Water .............................................................................. 22 6.2 Trends in potable water use in the ACT ................................................................................ 22 7 What is a sustainable level of use?................................................................................ 23 7.1 Sustainable Level of Resource Use – Water.......................................................................... 23 7.2 Sustainable Level of Resource Use – Reclaimed Water Discharge....................................... 23 7.3 Discharge of Treated Effluent................................................................................................ 24 7.4 Energy Use in Water and Sewerage....................................................................................... 26 7.4.1 ACT Energy Use in Water and Sewerage 26 8 Reducing the footprint.................................................................................................... 27 8.1 Effective measures for reducing the Footprint – Potable Water............................................ 27 8.2 Reducing the Footprint - wastewater ..................................................................................... 28 8.3 Reducing the Energy Footprint - water.................................................................................. 28 8.4 Reducing the Energy Footprint - wastewater......................................................................... 28 9 The environmental, economic and social impacts of reduced potable water consumption and a sustainable population ......................................................................... 30 10 The role of the ACT in the region in relation to potable water supply.............. 30 ACTEW Submission to Inquiry into Ecological Carrying Capacity of the ACT and Region 2 Table of Figures Figure 1 Legislative Framework for ACT Water and Sewerage Services ................................................ 4 Figure 3 – Approximate net ACT Contribution to Murray Darling Basin Flows ........................................ 8 Figure 4: CSIRO predictions for climate change by 2030 ......................................................................... 10 Figure 5: Four Dam inflow 1871 to 2009................................................................................................... 12 Figure 6. Changes in Macroinvertebrate Community in Response to 2003 Bushfires ........................... 18 Figure 7 LMWQCC Contribution to Murrumbidgee River Flow........................................................... 24 Figure 8 ACT Electricity Consumption ................................................................................................... 26 List of Tables Table 1 Summary of ACT Water Resource over Different Periods........................................................... 8 Table 2 Areas in ACT Water Storages.................................................................................................... 17 Table 3: Future unrestricted water demand................................................................................................ 21 Table 4 Use of Water (kL/property/day) in Australian Cities................................................................ 22 Table 5 Summary of Results of Murrumbidgee River Monitoring Program ............................................. 25 ACTEW Submission to Inquiry into Ecological Carrying Capacity of the ACT and Region 3 Abbreviations ACT Australian Capital Territory ACTEW ACTEW Corporation Ltd ActewAGL Public/private company operating ACT water supply under contract ACTPLA ACT Planning and Land Authority ADR Accelerated Demand Reduction BOM Bureau of Meteorology CSIRO Commonwealth Scientific and Industrial Research Organisation CGBT Cotter Googong Bulk Transfer DAFF Dissolved air flotation filtration e-flows Environmental Flows ECGBT Extended Cotter Googong Bulk Transfer EPBC Act Environmental Protection and Biodiversity Conservation Act, 1989 EIS Environment Impact Statement FWO Future Water Options GHG Greenhouse Gas GL Gigalitre (1,000,000,000 litres) GL/yr Gigalitre per year Ha Hectare ICRC Independent Competition and Regulatory Commission km Kilometre LOS Level of Service L Litre L/c/d Litres per capita per day LMWQCC Lower Molonglo Water Quality Control Centre m Metre MDBA Murray Darling Basin Authority ML Megalitre (1,000,000 litres) ML/d Megalitre per day mm Millimetre NCP National Capital Plan NEB Net Economic Benefit NPR Non-Potable Reuse NSW New South Wales PWCM Permanent Water Conservation Measures QCC Queanbeyan City Council SDL Sustainable Diversion Limit (from the MDBA Basin Plan) SEACI South East Australia Climate Initiative SKM Sinclair Knight Merz Pty Ltd TBL Triple Bottom Line TWAW Think water, act water UV Ultraviolet light WPP Water Purification Plant WSAA Water Services Association of Australia WTP Water Treatment Plant ACTEW Submission to Inquiry into Ecological Carrying Capacity of the ACT and Region 4 1 Introduction – ACTEW and its submission ACTEW Corporation Limited (ACTEW) is an unlisted public company with assets and investments in water, sewerage, electricity, gas and telecommunications. The company is owned by the ACT Government and has two voting shareholders: the Chief Minister and Deputy Chief Minister of the ACT. ACTEW owns the water and sewerage business and assets in the ACT. Investments include a 50% ownership of ActewAGL and an 18% shareholding in TransACT Communications Pty Limited. The mission of ACTEW includes: o Ensuring a safe and reliable water supply for the ACT and Region. o Maximising the efficiency, reliability and sustainability of water and sewerage services to the ACT and Region in accordance with environmentally sustainable principles. o Achieving a satisfactory return on ACT water, sewerage, energy and communication investments. ACTEW operates under the Utilities Act 2000, and is subject to independent regulation on prices, public health requirements, environmental requirements and technical regulation, as set out in the 2010 study report Future Options Review: Canberra Sewerage Strategy 2010-2060. Figure 1 Legislative Framework for ACT Water and Sewerage Services ACTEW Submission to Inquiry into Ecological Carrying Capacity of the ACT and Region 5 ACTEW regularly carries out strategic planning studies of the water available to the ACT and various development possibilities, to ensure that the ACT and Queanbeyan continue to have a safe and reliable water supply. A summary of the current situation is presented in this submission for the information of the Inquiry into the Ecological Carrying Capacity of the ACT. ACTEW has recently completed a study of possible future scenarios