Development of Stochastic Multisite Rainfall and Urban Water Demand Models for the Central Coast Region of New South Wales

The report presents a novel approach to simulating daily catchment rainfall, streamflow and urban demand for water supply headworks modelling of the Central Coast Region of New South Wales. In order to evaluate the impact of water extractions on the ecology of streams daily water demand and headworks, a variety of models were required.

Many authors have established numerous dependencies underlying urban water demand. Each of these complexities is taken into consideration to develop an accurate synthetic rainfall model. The DRIP rainfall model is used to simulate daily multi site rainfall based on rainfall at a single site. The rainfall series generated by the multi site method are used in a non parametric regional demand model to estimate daily water demand. Despite lacking data, the methodology adopted was able to adequately estimate regional water demand including day to day variation and seasonal trends of demand.

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Integrated Water Cycle Management: Analysis of Resource Security

This paper presents a detailed summary on the impact of integrated water cycle management designs on the security of regional water supplies. The investigation examines the methodologies of the Sydney Water Supply Corporation and water consumption data of Greater Sydney residents to demonstrate the extent of regional water security.

The paper finds the use of demand management measures will not defer augmentation of the water supply headworks system. However, the installation of rainwater tanks has the potential to defer augmentation for many decades. Illustrations show conflicting environmental and economic objectives.

The analysis employs regional water demand models developed by Dr Peter Coombes to investigate the impacts of demand management measures and rainwater tanks on the economy and environment. The systems methodologies described in the paper have widespread application.

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Responsible Water Use at Armstrong Creek

This report is about providing additional local water sources and demand management that improve the security of regional water supplies. These types of strategies will deliver increased flexibility to regional water planning.

The proposed integrated water cycle management strategy for Armstrong Creek will reduce water demands by 75% and sewerage discharges by 63% whilst minimising greenhouse gas emissions.

The proposed strategy for Armstrong Creek provides an opportunity to demonstrate a high level of innovation in providing integrated water and energy management at a regionally significant land release area.

The Armstrong Creek project could be a demonstration project for innovative water and energy management. It will deliver critical analysis and testing of modern model planning structures and infrastructure delivery strategies that will allow a more sustainable water future.

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