A Decision Support System For Sustainable
Groundwater Management.
Case Study: Gnangara Sustainability
Strategy – Western Australia
Author(s)
A. Elmahdi & D. McFarlane
Abstract
The Gnangara Sustainability Strategy is a cross-government initiative that aims
to ensure there is sufficient groundwater in the Gnangara Mound for drinking
and commercial use, and to meet existing and future environmental needs. The
Gnangara Groundwater System (GGS) is a large aquifer situated in the southwest
region of Western Australia. Historically, the GGS has been considered to be an
infinite reservoir for water, but this impression has quickly shifted following the
realization that 45 GL of water has been lost per annum since the late 1990s. The
main causes for this loss are lower rainfall since 1975; land uses that reduce
recharge; and increased water extraction. As a result, many significant
environmental features, especially wetlands, are declining in health and value.
The GGS faces increasing demands for its water from several key users
within the public water supply, environmental and agricultural sectors. However,
declining water levels related to climate change, demand urgent prioritisation of
a set of inter-sectoral and inter-temporal land use planning and water abstraction
rules that would maximize societal welfare while ensuring the sustainability of
this crucial water source and its dependant ecosystems. The sustainable
management of the GGS is a major problem for water and environmental
Innovative modelling approaches should be employed to assist in better decision
making by modelling the feedback loops inherent in the system and analysing
the impact of alternative land use and water policy scenarios.
This paper details a systems approach to developing an integrated decision
Keywords
DSS, groundwater, sustainable management, scenario analysis, integrated modelling
Related Book
Other papers in this volume
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