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South Nicholson-Georgina groundwater divides
2024-09-30T00:00:00
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Groundwater divides created for the South Nicholson – Georgina (SNG) region as part of the National Groundwater Systems project in the Exploring for the Future program.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The </SPAN><SPAN>groundwater divides </SPAN><SPAN>dataset was derived from the regional watertable surface, which was created using groundwater elevations from a subset of bores attributed to the Barkly, Narpa, Cockroach and Toko group aquifers of the Georgina Basin. </SPAN><SPAN>At the basin-scale, these aquifers are assumed to be hydraulically connected due to the absence of regional aquitards or other geological structures. These aquifers, commonly referred to in this report as the ‘regionally unconfined aquifers’, are the most common aquifers for groundwater supplies over most of the SNG region (except for the far southern parts where the Georgina Basin is overlain by younger Mesozoic aquifers of the Great Artesian Basin).</SPAN></P><P><SPAN>The north-east trending groundwater divide separates the regional unconfined aquifers of the Georgina Basin into northern and southern groundwater flow systems. The location of the groundwater divide has greater uncertainty towards the sourthern extent due to less bore data near the basin boundary. This groundwater divide is in the vicinity of a prominent geological basement structure known as the Alexandria-Wonarah High.</SPAN></P></DIV></DIV></DIV>
Client Services
Geoscience Australia
GPO Box 378
Canberra
ACT
2614
+61 2 6249 9111
groundwater
divide
South Nicholson
Georgina
NT
QLD
Northern Territory
Queensland
© Commonwealth of Australia (Geoscience Australia) 2024. This product is released under the Creative Commons Attribution 4.0 International Licence. http://creativecommons.org/licenses/by/4.0/legalcode
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Coordinates defining the features.
Confidence
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Confidence level of groundwater divide. There are two levels:
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Geoscience Australia
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The groundwater divides were derived from the watertable trend map and therefore only approximate the location of groundwater flow divides. In regions that are data-poor, topographic data and spatial carbonate exposure data was used delineate the groundwater flow divide. Regions of uncertainty are marked by '?' in the symbology, and should be considered provisional.
References:
BoM (Bureau of Meteorology) (2023) National Groundwater Information System (NGIS) v1.7.2, Australian Government, http://www.bom.gov.au/water/groundwater/ngis/index.shtml
DEPWS (Department of Environment, Parks and Water Security) (2023) Northern Territory bore locations, water quality and groundwater levels [data set], https://data.nt.gov.au/dataset/nt-bore-locations-water-quality-and-groundwater-levels
Gallant JC, Dowling TI, Read AM, Wilson N, Tickle P and Inskeep C (2011) SRTM-derived 1 Second Digital Elevation Models Version 1.0 [data set], Geoscience Australia, Canberra, https://pid.geoscience.gov.au/dataset/ga/72759.
QDRDMW (Queensland Department of Regional Development, Manufacturing and Water) (2023) Groundwater database – Queensland, https://www.data.qld.gov.au/dataset/groundwater-database-queensland.
Client services
Geoscience Australia
GPO Box 378
Canberra
ACT
2601
clientservices@ga.gov.au
AU
+61 2 6249 9111
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