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  • This service shows the Principal Hydrogeological Divisions of Australia which was produced from the 1:5,000,000 scale Hydrogeology of Australia map (Jacobsen and Lau, 1987).

  • Multiple new geophysical (airborne electromagnetics, borehole gamma and NMR), geospatial (LiDAR), sonic drilling and geochronological datasets have been used to map and resolve the nature of Quaternary fluvial deposition in the Lower Darling Valley (LDV), NSW. The LDV Cenozoic sequence contains Paleogene and Neogene shallow marine, fluvial and shoreline sediments overlain by Quaternary lacustrine, aeolian and fluvial units. In the LDV Quaternary fluvial sequence, multiple scroll-plain tracts are incised into higher, older more featureless floodplains. Prior to this study, these were respectively correlated to the Coonambidgal and Shepparton Formations of the Riverine Plain in the eastern Murray Basin and associated with the subsequently discarded Prior Stream/Ancestral River chronosequence of different climatically controlled depositional styles. In contrast to that proposition, we ascribe all LDV Quaternary fluvial deposition to lateral-migration depositional phases of one style, though with more variable stream discharges and channel and meander-scroll dimensions. Successively higher overbank-mud deposition through time obscures scroll traces and provides the main ongoing morphologic difference. A new morphostratigraphic unit, the Menindee Formation, refers to the mostly older and higher floodplain sediments, where scroll traces are obscured by overbank mud which continues to be deposited by the highest modern floods. Younger inset scroll-plain tracts, with visible scroll-plain traces, are still referred to the Coonambidgal Formation. Another new stratigraphic unit, the Willotia beds, refers to even older fluvial sediments, now above modern floodplain levels and mostly covered by aeolian sediments. This work provides important insights into hydrogeological processes and the nature of Australian Quaternary fluvial deposition.

  • The success of Aquifer Storage and Recovery (ASR) schemes rely on defining appropriate design and operational parameters in order to maintain high injection rates over the long term. The objective of this study was to develop a methodology to define the water quality criteria and hence minimum pre-treatment requirements to allow recharge at an acceptable scale. Laboratory column studies using four types of treated source water were performed at constant temperature (19°C) with light excluded, to determine the potential for near-well clogging for a proposed ASR scheme. The source water was turbid raw water from the Darling River and three treated waters including bank filtration, coagulation, and coagulation and granular activated carbon (GAC). Over the 37 days of the experiment, declines in hydraulic conductivity occurred in the columns packed with representative aquifer fluvial sands. The GAC treated town water gave an 8% decline in hydraulic conductivity, which was significantly different from the other three source waters with mean declines of 26-29%. Over the first 3 cm of column length, where most clogging occurred in each column, the mean hydraulic conductivity declined by 10% for GAC treated water compared with 40 to 50% for the other source waters. Evidence from polysaccharide concentrations and bacterial numbers in columns when they were dissected and analysed at the end of the experiment confirmed that biological growth was the dominant form of clogging in the treated waters. Further chemical clogging through precipitation of minerals was found not to occur within the laboratory columns, and dispersion of clay was also found to be negligible.

  • A GA Professional Opinion report developed for the Australian Department of Sustainability, Environment, Water, Population and Communities (DSEWPaC) to outline the existing State of Knowledge for 8 selected black and brown coal basins in Eastern Australia. This work is part of GA's contribution under the National Collaboration Framework Project Agreement on coal seam gas and large coal mines with DSEWPaC.

  • Broken Hill Managed Aquifer recharge Projects 3D models and Fly-through

  • The hydrogeology of a 68 000 km2 region of arid central Australia has been assessed and mapped at 1:500 000 scale using a GIS to interpret various spatial data sets and compile statistics of water bore information. This work forms a part of the Western Water Study, a collaborative venture between Federal, Territory and Aboriginal representative agencies, which has the objective of improving access to groundwater information for Aboriginal people on their land. The study area is underlain by Proterozoic basement (Arunta Block), pre-Mesozoic sedimentary basins (Amadeus and Ngalia Basins) and Cainozoic sediments. Based on the analyses of 850 water bores , the study area is mapped as seven different aquifer systems to cover regional variations in hydrogeology. Palaeodrainages act as a sink along which groundwater drains to associated internal discharge playas. Statistical groundwater data for these systems and the individual geological formations drilled provide a starting point for further groundwater assessment in other areas of central Australia that have similar geology. Only one aquifer system representing about 3% of the study area in Cainozoic sediments along a mountain range consistently provides low salinity « 1000 mg/L) potable groundwater, though potable water can occasionally be found elsewhere throughout the region. Large individual bore yields of over 20Us can be found in the pre- Mesozoic and Cainozoic systems while a lack of storage precludes sustained high yield production from bores in the Proterozoic.

  • The Broken Hill Managed Aquifer Recharge (BHMAR) project is part of a larger strategic effort aimed at securing Broken Hill's water supply and identifying significant water-saving measures for the Darling River system. Hydrogeological investigations to rapidly identify and assess potential MAR targets and groundwater resources over a large area (>7,500 km2), included acquisition of an airborne electromagnetics (AEM) survey, a 7.5 km drilling program (100 sonic and rotary mud holes), and complementary field and laboratory hydrogeochemical investigations. The study identified an excellent aquifer (the Calivil Formation), with high storage capacity, very high transmissivities (up to 50 l/s), and significant volumes of fresh groundwater. The aquifer is sandwiched between variably thick clay aquitards, and can be characterised as varying from a confined to a 'leaky confined' system. The hydraulic properties make the Calivil Formation aquifer potentially suitable for groundwater extraction and/or MAR injection, with excellent recovery efficiencies predicted. Mapping identified a number of potential suitable locations for MAR options, for which entry-level risk assessments were carried out. Targets were prioritised, and a pre-commissioning semi-quantitative residual risk assessment carried out for a priority site. Assessment of 12 hazard types included hydrogeological modelling, laboratory column clogging studies and geochemical assessment to assess source water treatment requirements. The study found that all of the scientific/technical risks for MAR at the priority target are low. The integrated analysis has identified a range of possible MAR options including injection, passive or enhanced recharge, and/or conjuctive use involving a combination of surface, groundwater extraction and/or MAR options.