Salinity risk assessment of an irrigation development using treated coal seam gas water in the Condamine River catchment
M. H. Crawford
A C , K. M. Williams A , A. J. W. Biggs A and E. Dafny B
+ Author Affiliations
- Author Affiliations
A Queensland Department of Natural Resources Mines and Energy (DNRME), Toowoomba, Qld 4350, Australia.
B University of Southern Queensland, National Centre for Engineering in Agriculture, Toowoomba, Qld 4350, Australia.
C Corresponding author. Email: Mark.Crawford@dnrme.qld.gov.au
Soil Research 59(1) 44-59 https://doi.org/10.1071/SR19375
Submitted: 10 December 2019 Accepted: 22 July 2020 Published: 24 August 2020
Abstract
All irrigation developments inherently carry a salinity risk, due to an unavoidable change in the water and salt balance. The time frame in which either land or water salinity will develop is driven by the ability of the landscape to absorb the change of water and salt supplied. Factors that influence this are landscape attributes, such as the size of the unsaturated zone and its properties (permeability and drainage), management considerations (land-use changes, water application rate and crop water use) and climate variability (temperature and rainfall). This study assessed the risk of secondary salinity expression occurring in an irrigation area in the Condamine-Balonne catchment in southern inland Queensland, Australia. The objectives were to (1) define the depth, size and properties of the unsaturated zone and regolith, (2) define deep drainage rates for past, present and future land uses and (3) assess this information to calculate the risk that groundwater table rise may result in surface salinity expression. Data collected during field investigations was used to conceptualise the regolith architecture, undertake hydrogeological modelling, estimate the available moisture storage capacity of the unsaturated zone and model paddock deep drainage characteristics. The work identified that irrigation-induced deep drainage had started to mobilise salt stores in the unsaturated zone. It also identified connectivity between land management and salt discharges into the Condamine River. As the water supply for the scheme is scheduled to continue until 2030, there is a clear risk of the unsaturated zone moisture storage capacity being exceeded, leading to both land and surface water salt expressions.
Additional keywords: electrical resistivity tomography (ERT), hydrogeology, Hydrus, water balance.
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