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SEMINAR: Impact of different water allocation strategies to manage groundwater resources in Western Australia: equity and efficiency considerations

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Impact of different water allocation strategies to manage groundwater resources in Western Australia: equity and efficiency considerations Other events...
In many parts of the world groundwater is depleting at an alarming rate. Water regulation authorities are facing the challenge of reducing groundwater extraction by existing users. However, to take appropriate adaptation measures it is necessary to understand the distributional consequences of groundwater depletion. In water resource management, the issue of the equity-efficiency trade-off has been explored in a number of different areas, but not in the context of water allocation reduction from a groundwater system. To contribute to this knowledge gap, we conduct an empirical case study for the Gnangara Groundwater System (GGS) of Western Australia. The water level in this system is depleting at a consistent rate for various reasons such as draught, increasing demand and climate change. The agency is currently actively considering reduction of allocation under existing licences. Using an individual-based farm optimization model parameterized with the individual licence-specific data on area and water allocation we test a combination of scenarios: with and without area constraint, regional and individual farm-specific models. We observe that with the current land use distribution, a 25% reduction of allocation could reduce net revenues per hectare by 14%. However, in absence of area restriction the loss in net revenues could be as high as 22%. Farm level analysis showed that in terms of percentage reduction farms with lower initial water allocation are most affected, whereas, in terms of dollar per percentage allocation reduction farms with higher initial allocation are more affected. These results reveal the complexity in setting up an appropriate allocation reduction strategy. (Authors: Senior Research Fellow Md Sayed Iftekhar and Senior Lecturer James Fogarty)
Speaker(s) Senior Research Fellow Md Sayed Iftekhar
Location Agriculture Lecture Theatre, North Wing Agricultural Building (G.013)
Contact Deborah Swindells <[email protected]> : 6488 2539
URL https://www.are.uwa.edu.au/research/seminars
Start Fri, 03 Jun 2016 11:00
End Fri, 03 Jun 2016 12:00
Submitted by Deborah <[email protected]>
Last Updated Tue, 07 Jun 2016 13:53
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