Recharge processes at the St George Irrigation Area

Presentation


Dafny, Elad. 2015. "Recharge processes at the St George Irrigation Area." Grundy, Paul (ed.) 2nd Australian Cotton Research Conference 2015: Science Securing Cotton's Future. Toowoomba, Australia 08 - 10 Sep 2015 Australia.
Paper/Presentation Title

Recharge processes at the St George Irrigation Area

Presentation TypePresentation
Authors
AuthorDafny, Elad
EditorsGrundy, Paul
Journal or Proceedings TitleProceedings of the 2nd Australian Cotton Research Conference 2015
Number of Pages1
Year2015
Place of PublicationAustralia
Web Address (URL) of Paperhttp://www.cottonresearch.org/Welcome
Conference/Event2nd Australian Cotton Research Conference 2015: Science Securing Cotton's Future
Event Details
2nd Australian Cotton Research Conference 2015: Science Securing Cotton's Future
Event Date
08 to end of 10 Sep 2015
Event Location
Toowoomba, Australia
Abstract

Since the 1950s, irrigated cropping has taken place in the St George Irrigation Area (SGIA), following clearance of the native vegetation and construction of water canals, carrying river water to the agricultural lands. The change from open-forest to arable lands mostly irrigated involved changes to the groundwater balance and in turn, groundwater quality. Deep-drainage and leaks from the water canals and dams, to name two possible water sources, which carry different amounts of salts into the sub-surface, may affect the groundwater salinity.
The groundwater under the SGIA ranges in quality from fresh water, with about 50 mgCl/L, to salty water, with ~10,000 mgCl/L. We analysed all of the available bore water samples, to detect any on-going salinity trends (rising/stable/falling) and identify potential sources. Results indicate the existence of four end-members, namely, saline formation water, brackish deep-drainage, slightly brackish flood-recharge water, and fresh imported river-water. Each of these has a typical geochemical composition, which allows reconstructing the past and the current recharge processes in the SGIA. The groundwater composition at many bores varied over time, to reflect the changes in the dominant end-member.
This study demonstrates that effective changes in groundwater quality can occur in a relatively short time-frame.

Keywordsgroundwater; St George Irrigation Area; recharge; geochemical evolution
ANZSRC Field of Research 2020370799. Hydrology not elsewhere classified
410406. Natural resource management
Public Notes

Abstract only published in Proceedings.
Copyright 2015 author. This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.

Byline AffiliationsNational Centre for Engineering in Agriculture
Institution of OriginUniversity of Southern Queensland
Funding source
Grant ID
CRDC project 11-12FRP00044
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