A farm-scale, bio-economic model for assessing investments in recycled water for irrigation
L. E. Brennan A D G , S. N. Lisson B D , P. L. Poulton C D , P. S. Carberry C D , K. L. Bristow E and S. Khan FA CSIRO Sustainable Ecosystems, 306 Carmody Rd, St Lucia, Qld 4067, Australia.
B CSIRO Sustainable Ecosystems/Tasmanian Institute of Agricultural Research, Private Bag 54, Hobart, Tas. 7001, Australia.
C CSIRO Sustainable Ecosystems, PO Box 102, Toowoomba, Qld 4350, Australia.
D Agricultural Production Systems Research Unit, PO Box 102, Toowoomba, Qld 4350, Australia.
E CSIRO Land and Water/CRC for Irrigation Futures, PMB, PO Aitkenvale, Qld 4814, Australia.
F CSIRO Land and Water/Charles Sturt University, PMB No. 3, Griffith, NSW 2680, Australia.
G Corresponding author. Email: lisa.brennan@csiro.au
Australian Journal of Agricultural Research 59(11) 1035-1048 https://doi.org/10.1071/AR06316
Submitted: 21 September 2007 Accepted: 21 July 2008 Published: 14 October 2008
Abstract
Demand for water in Australia is increasing along with growing pressure to maximise the efficiency of irrigation water use and seek additional and alternative irrigation supplies. The scarcity of water supplies coupled with the need for urban communities to dispose of large quantities of treated recycled water from sewage treatment plants has led to increasing interest from urban and rural communities in the reticulation of this water for irrigating adjacent crop-production areas. Proposals to use recycled water inevitably lead to a complex range of issues that need to be addressed, including:
costs and benefits of supplying an additional source of water to current or new cropping systems;
optimum irrigation design and management, particularly where there are multiple sources of irrigation water;
management of overflow from on-farm water storages; and
environmental implications with regard to salinity, runoff, drainage, nitrate leaching, and environmental flows.
Simulation models can capture many of the key factors and processes influencing irrigated crop production systems, and can play a useful role in exploring these issues. In this paper, we have described an approach that couples agricultural production system and economic models in a way that enables analysis of the likely benefits and risks of investing in recycled water, although the analysis is equally relevant to any assessment of the value of an additional source of irrigation water, particularly saline water. The approach has been illustrated with a case study of a mixed-crop farm in the Darling Downs region of Queensland, Australia, in which the farm-scale crop production, economic, and environmental implications of investing in recycled water were considered.
Additional keywords: on-farm water storage, APSIM, irrigated cotton.
Acknowledgments
The authors acknowledge the valuable cooperation and contribution of the Darling Downs farmers who participated in this study. Merv Probert, CSIRO Sustainable Ecosystems, Brisbane, contributed to the salt modelling aspects of the study. Members of the Darling Downs Vision 2000 Technical Sub-Committee provided valuable guidance. This study was jointly funded by CSIRO and Darling Downs Vision 2000 Inc.
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