Potential recharge to groundwater estimation, grid dataset, McBride Basalt Province

• Other Authors: Commonwealth of Australia (Geoscience Australia) (distributor), Commonwealth of Australia (Geoscience Australia) (pointOfContact), Cook, S. (author), Kilgour, P.L. (author), Kilgour, P.L. (pointOfContact), Lai, E.C.S. (author), Manager Client Services (pointOfContact), Manager Client Services (publisher), Minerals, Energy and Groundwater Division (resourceProvider), Ransley, T. (author)
• Format: Dataset
• Language: unknown
• Published: Geoscience Australia
• Subjects: geoscientificInformation; EARTH SCIENCES; EFTF; Exploring For The Future; Australia; Queensland; QLD; Web Service; Upper Burdekin; UB; McBride Basalt; Volcanic Province; Permeability; Potential Recharge; Published_External; Iceland
• Online Access: https://researchdata.edu.au/potential-recharge-groundwater-basalt-province/1459133; https://pid.geoscience.gov.au/dataset/ga/133830; https://doi.org/10.26186/133830

Maintenance and Update Frequency: asNeeded Statement: The input datasets are soil layers and surface geological units. Soil data acquired from ASRIS provided soil permeability information. The near-surface permeability was used as this is the first layer through which water would travel. It was classified into discrete classes, based on the ASRIS handbook (CSIRO 2012, p51), and then scores assigned. Ks1 range Score Description 30-300 8 highly permeable (10 is level above which isn’t here) 3-30 6 moderately permeable 0.3-3 3 low permeable 0.03 -0.3 1 very low permeable <0.03 0 blank (remove?) as impermeable Surface geology, based on the Queensland Detailed surface geology polygons, was considered in several stages. Firstly a mask was used to exclude areas outside the McBride Basalt Province, namely the areas of outcropping Palaeozoic basement rocks. It was hypothesised that locations proximal to volcanic vents would be preferential recharge sites, due to deeply penetrative columnar jointing. This suggestion is based on observations in South Iceland, where fully-penetrating columnar joint sets are more prevalent in proximal facies compared to distal facies in South Iceland (Bergh & Sigvaldson 1991). To incorporate this concept, it was decided that polygons mapped as having vent-proximal facies (i.e. “/v” in the mapping code) would be provided a weighting score of 7. The remaining geology was incorporated with the thought that recent lava flows retain blocky structures, while weathering has smoothed out the surfaces of the oldest lava flows to begin soil development. As such, older basalts have lower weighting scores compared to the youngest. Within this rating, sedimentary units have been considered: alluvium is weighted higher than most, while lacustrine clays and silts are weighted lower. However most sedimentary units are given a moderate score, with a reliance on the soil Ks values to discriminate units. Standing surface water bodies have been deemed a score of 0, as these are sites of water without ...