Water Journal : Water Journal December 2012
small water & wastewater systems refereed paper technical features 68 DECEMBER 2012 water Key observations include: • Thermal desalination, performs well against all criteria, particularly levelised cost, carbon intensity and network effectiveness; • Sewer mining and stormwater harvesting options perform similarly and particularly well against the reliability and network effectiveness criteria; • The stormwater harvesting options perform well particularly in terms of carbon intensity; and • The roofwater harvesting option performs the worst of the options assessed (predominantly influenced by economies of scale, network/ storage effectiveness and reliability), but roofwater harvesting performs well in terms of carbon intensity. Results summary The results from the case study analysis don’t point to one supply type or scale as providing an ideal decentralised strategy solution. However, what can be concluded is that: • There is an abundance of local and variable supply sources within the city that are suitable for recycled water supply; • The Master Plan supports supply diversity, adaptability and environmental benefit in identifying recycled water demand opportunities; and • The analysis is designed to support and assist urban planners, architects and developers in achieving sustainable alternative water supply outcomes. Conclusions The analysis demonstrates an abundance of available water for capture and use as an alternative to current potable water. While no single entity can realise the opportunities identified, an across-Government approach is required to realise the alternative ways in supplying water back into the landscape and to replace potable water. Private industry (urban planners, architects and developers), along with Government, will play a key role in delivering these plans, with an across-organisation approach likely to identify cross-subsidies and avoided costs in making this strategy more financially effective. Acknowledgements GHD would like to recognise the contributions made by the City of Sydney, ISF and Sydney Water in delivering this study. The Authors Mike Healey (email: Mike. Healey@ghd.com) is a Civil Engineer with over 20 year’s experience in the water and wastewater industry, including master planning, integrated water management planning, modelling and design of water, recycled and wastewater networks, water use audits, leakage analysis and water pressure management. He leads a group of Water Systems planning engineers developing integrated water servicing strategies for growth and infill development and water and wastewater system performance assessments, using various modelling and analytical and options analysis tools. Mike is Water Systems Planning Manager with GHD in Sydney and was project manager and technical lead on the Decentralised Water Master Plan for the City of Sydney. Shane Tyrrell (email: Shane.Tyrrell@ghd.com) is an environmental engineer and integrated water management specialist with over seven years’ experience in the water industry. His experience includes integrated water management, strategic planning of water and wastewater systems, water sensitive design, hydraulic modelling and simulating the urban water balance. Shane has experience in the application of decision support systems to assess alternative options incorporating both financial and non-financial criteria. He was also involved in the development of GHD’s award winning Integrated Management Toolkit and was the technical lead on the City of Sydney’s Decentralised Water Master Plan. He is currently Water Systems Planning Technical Lead with GHD Sydney. Dan O’Halloran (email: Dan. OHalloran@ghd.com) is GHD Global Service Line Leader for Integrated Water Cycle Management (IWCM) and is responsible for leading and co-ordinating GHD’s technical response to IWCM. Dan’s background is in strategic water and wastewater infrastructure planning and the analysis of related sustainability issues. In 2007 he completed a Master’s in “Strategic Leadership toward Sustainability” in Karlskrona, Sweden to further his understanding in the field. Dan’s recent work has involved the preparation of IWCM strategies on lot, development and city scales in Melbourne and Sydney using GHD’s Integrated Water Management toolkit, triple bottom line frameworks and life cycle assessment software. Dr Bhakti Devi (email: firstname.lastname@example.org. gov.au) has over 15 years of experience working in the field of sustainable water management. She has assisted water utilities across Australia to develop sustainable water management strategies and demand management programs. She has also worked with local government agencies across the Sydney Metropolitan area to develop decision-making frameworks and policies for total water cycle management. As Water Strategy Manager for the City of Sydney, She managed the development of an innovative and comprehensive Decentralised Water Master Plan. She has been instrumental in transforming the City of Sydney to a water-sensitive Council in alignment with Council’s Sustainable Sydney 2030 long term community strategic plan. Figure 11. Multi-criteria assessment summary (the higher the score the better the option).
Water Journal February 2013
Water Journal November 2012-1