A large number of workshops on the philosophy of local scale processes as a linked component of regions were held during the early 2000s that included earlier versions of PURRS (Probabilistic Urban Rainwater and wastewater Reuse Simulator) model. The PURRS model uses continuous simulation of the water balance of complete local systems, real rainfall, Monte Carlo processes with synthetic rainfall, behavioural demand processes, water quality and human health processes to evaluate WSUD and IWCM strategies. This processes generates probabilistic outputs for water supply, wastewater discharges and stormwater runoff that allow the realistic design linkages with surrounding infrastructure.

A series of workshops that address local scale processes that will provide the latest version of PURRS are planned for the near future.

Another series of workshops are also being developed to demonstrate the latest version of the Systems Framework that includes receiving water processes, flooding and multiple scale water quality processes. For example, the Systems Framework can be used to evaluate the impacts on local policies (for example: changed land uses – reducing effective impervious areas, rain gardens or rainwater tanks) on health of waterways, relative human health (including Quantitative Microbial Risk Assessment) , urban flooding, receiving water quality (such as in Port Philip Bay or Lake Burley Griffin) and whole of system economic evaluation.

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Dr Peter Coombes

Dr Coombes has spent more than 30 years dedicated to the development of systems understanding of the urban, rural and natural water cycles with a view to finding optimum solutions for the sustainable use of ecosystem services, provision of infrastructure and urban planning.

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