Temporal trends of groundwater levels in the Lower Balonne 2000-2014

Technical report


Dafny, Elad. 2014. Temporal trends of groundwater levels in the Lower Balonne 2000-2014. Toowoomba, Australia. University of Southern Queensland.
Title

Temporal trends of groundwater levels in the Lower Balonne 2000-2014

Report TypeTechnical report
Authors
AuthorDafny, Elad
Institution of OriginUniversity of Southern Queensland
Number of Pages60
Year2014
PublisherUniversity of Southern Queensland
Place of PublicationToowoomba, Australia
Abstract

Groundwater levels at the outskirts of the Balonne floodplain and the newer irrigation areas away from St George have remained relatively stable over the last decade, reflecting no association with temporal changes of rain and river flow within the same period. In contrast, there are several bores, located along the major streams, which indicate an induced streambed recharge during the 2010-2013 high flow period; this evidence, along with groundwater level contours and soil mapping, suggest that streambed recharge is probably more substantial in areas where the stream incises lighter textured soils, e.g., Sodosols.
The groundwater levels under the 'original' St George Irrigation Area (SGIA) and another irrigated area (Kia Ora farm and surroundings), where groundwater has not been intensively monitored, are rising continuously, as deep drainage is accumulating at the water table. The deep drainage is roughly estimated to be in the order of 45-120 mm/yr, which coincide with the overall range for irrigated cotton in Australia.
It is highly recommended to recommence the frequent monitoring scheme in the SGIA, which ceased in the late-2000s. It is also recommended to initiate monitoring at other irrigated areas which are not monitored at the moment. This will allow better risk management in the future.

Keywordsgroundwater; St George irrigation area; lower Balonne; monitoring; deep drainage
ANZSRC Field of Research 2020370799. Hydrology not elsewhere classified
410406. Natural resource management
410404. Environmental management
Public Notes

Copyright 2014 University of Southern Queensland. 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
Funding source
Grant ID
CRDC project 11-12FRP00044
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