Water Journal : Water Journal December 2012
small water & wastewater systems refereed paper 62 DECEMBER 2012 water technical features Abstract The City of Sydney is working to realise its vision to become a ‘Green, Global and Connected’ city, a vision articulated in its Sustainable Sydney 2030 strategy. The Decentralised Water Master Plan (DWMP) is one of five green infrastructure plans supporting this strategy. The DWMP incorporates water into the City’s sustainable vision by identifying decentralised water supply opportunities that combine with traditional water sources to create an integrated, adaptable and resilient network. The DWMP constitutes a suite of plans including a Water Efficiency Plan, Stormwater Infrastructure Improvement Plan, Water Sensitive Urban Design Plan and the Decentralised Recycled Water Plan. This paper describes: 1. The process of developing the baseline for the Decentralised Water Master Plan and how spatial and temporal mapping can be used to simplify baseline development and communication of results; and 2. How the results from the baseline analysis were used to identify decentralised water supply (and stormwater pollution reduction) opportunities. The key outcome from the baseline analysis shows an abundance of water within the City that can be harnessed at various scales considering the ‘nature’ of demand, environmental impacts and community expectations. The baseline analysis also identified stormwater pollution loads for each sub-catchment and water quality and flooding hotspots across the city. The baseline analysis provided relevant and detailed information for city planners, architects and developers and is transferable to other localities. The opportunities analysis illustrated the potential volumetric yield of each supply option and assessed those options according to cost, social and environmental criteria. Significant consultation was undertaken to ensure the community and other stakeholders had opportunities for input. It is intended that the final plan is not a fixed document but will evolve, taking into account changing data and contexts. Introduction Sustainable Sydney 2030 articulates the ‘Green, Global and Connected’ vision for the City of Sydney. Central to this vision was the aim of becoming internationally recognised as an environmental leader, with economic growth driven by green industry. The DWMP is one of five integrated green infrastructure plans supporting the Sustainable Sydney 2030 strategy (with others considering waste, renewable energy and combined heat and power generation). The DWMP supports the Sustainable Sydney 2030 vision by identifying decentralised and integrated water supply opportunities that: • Provide fit-for- purpose water; • Reduce reliance on the city’s traditional water supply network; • Identify potential demand reductions through water efficiency; • Reduce pollution to receiving environments as a result of wastewater overflows and stormwater discharges; and • Retain water within the urban environment where possible, enhancing Sydney’s liveability. The plan does not attempt to identify solutions for all of the existing and anticipated opportunities within the city over the coming 20 years. Rather, it demonstrates the abundance of water resources within the urban environment and provides the visibility of opportunities that could be readily matched with existing and future non-potable demands. The plan also provides a baseline and opportunity information that can be leveraged by Government agencies, urban planners, developers and architects, and commercial partners in moving towards the Sustainable Sydney 2030 vision. M Healey, S Tyrrell, D O’Halloran, B Devi Identifying decentralised water supply and stormwater pollution reduction opportunities A DECENTRALISED WATER MASTER PLAN FOR THE CITY OF SYDNEY Figure 1. The City of Sydney LGA and catchments.
Water Journal February 2013
Water Journal November 2012-1