Legacy product - no abstract available

The groundwater modelling sub-committee set up by the Steering Committee in June 1980, met in October and recommended that a preliminary model of the Basin should be attempted; it should contain 3 layers, with a 10 x 10 grid (300 nodes) and have the aim of increasing theaccuracy of solutions at later stages by decreasing the grid size. The sub-committee proposed that a whole basin model be attempted by the South Australian Department of Mines & Energy using a finite element method, and by the Water Resources Commission of New South Wales using a finite difference approach; the methods could then be compared before a more elaborate model was tried.

Tarawa is a coral atoll in the Gilbert Islands; it consists of a number of low islands, several of which contain discrete freshwater lenses overlying salt water. Resistivity depth probes indicate that the largest untapped lens is on the northern island of Buariki, and that this lens is up to 29m thick. The total safe yield of the Tarawa freshwater lenses is probably more than 12 1/s,and there is scope for the present groundwater development system of infiltration galleries to be extended.

This is the third quarterly report on the progress of the Murray Basin Hydrogeological Project. Participating organisations are the Geological Survey of New South Wales, the Water Resources Commission of New South Wales, the Geological Survey of Victoria, the State Rivers and Water Supply Commission of Victoria, the Department of Mines and Energy of South Australia, and the Bureau of Mineral Resources.

Legacy product - no abstract available

This is the second quarterly report on the progress of the Murray Basin Hydrogeological Project. In this report an outline map of the basin is included to indicate where activities have occurred during the quarter, and the general statement describing the Project forms the appendix. Participating organisations are the Geological Survey of New South Wales, the Water Resources Commission of New South Wales, the Geological Survey of Victoria, the State Rivers and Water Supply Commission of Victoria, the Department of Mines and Energy of South Australia, and the Bureau of Mineral Resources.

This product has been archived and while it is still available for download, Geoscience Australia can no longer offer related support or advice. Legacy product - no abstract available

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. In this study, AEM mapping validated by drilling has identified significant groundwater resources and potential MAR targets within shallow unconsolidated Pliocene sediments at relatively shallow depths (25-100m). Pliocene sand aquifers comprise the fluvial Calivil Formation, with the shallow marine Loxton-Parilla Sands restricted to the southernmost part of the area. The Calivil Formation is widely distributed, and has high storage capacity and very high transmissivities (up to 50 l/s), with particularly good aquifers developed in palaeochannels at the confluence of palaeo-river systems. The hydraulic properties make the Calivil Formation aquifer potentially suitable for groundwater extraction and/or MAR injection, with excellent recovery efficiencies predicted. The aquifer is sandwiched between variably thick clay aquitards, and can be characterised as varying from a confined to a 'leaky confined' system. Post-depositional warping, tilting and discrete offsets associated with neotoectonics are also recognised. Entry-level risk assessments were carried out for a number of potential MAR targets, with 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.

Legacy product - no abstract available

This DVD product contains relevant material from Milestone 5 and Milestone 6 of the Palaeovalley Groundwater Project. It has been produced for distribution to the key Project Stakeholders such as the Steering Committee and Technical Advisory Group