Implementing Resuspension Potential Method to Optimise Mains Cleaning Program Case study: Yarra Valley Water, Melbourne, Australia

Abstract: Routine cleaning of water mains is commonly employed by water utilities around the world as a proactive means of managing common water quality issues. When employed correctly, water mains cleaning can be effective in removing loosely deposited sediments and bio films that cause water discolouration, coliform regrowth and unpleasant tastes and odours. Despite its long history in the water industry, water supply practitioners continue to use highly subjective mechanisms to identify when, where and how much to spend on their mains cleaning programs. This report discusses the benefits of using the Resuspension Potential Method, an objective means of planning and implementing mains cleaning, to achieve an optimum outcome for both the water company and its customers. The RPM has been applied by Yarra Valley Water since September 2005 and it is now able to prioritize and target its mains cleaning efforts to achieve optimum outcomes