A DECISION SUPPORT TOOL FOR IRRIGATION INFRASTRUCTURE INVESTMENTS

Increasing water scarcity, climate change and pressure to provide water for environmental flows urge irrigators to be more efficient. In Australia, ongoing water reforms and most recently the National Water Security Plan offer incentives to irrigators to adjust their farming practices by adopting water-saving Irrigation infrastructures to match soil, crop and climatic conditions. Water Works is a decision support tool to facilitate irrigators to make long- and short-term irrigation infrastructure investment decisions at the farm level. It helps irrigators to improve the economic efficiency, water use efficiency and environmental performance of their farm businesses. Water Works has been tested, validated and accepted by the irrigation community and researchers in NSW, Australia. The interface of Water Works is user-friendly and flexible. The simulation and optimisation module in Water Works provides an opportunity to evaluate Infrastructure investment decisions to suit their seasonal or long-term water availability. The sensitivity analysis allows substantiation of the impact of major variables Net present value, internal rate of return, benefit cost ratio and payback period are used to analyse the costs and benefits of modern irrigation technology. Application of Water Works using a whole farm-level case study indicates its effectiveness in making long- and short-term investment decisions Water Works can be easily integrated into commercial software such as spreadsheets, GIS, real-time data acquisition and control systems to further enhance its usability. Water Works can also be used in regional development planning. Copyright (C) 2009 John Wiley & Sons, Ltd.