Water levels


Water level data for the Queensland part of the Clarence-Moreton bioregion were obtained from the DNRM groundwater database (Bioregional Assessment Programme, Dataset 2). The ‘water level’ information in the database refers to the distance from the natural ground surface or reference point to the water surface in a groundwater bore. When the water level is above a reference point, it has a positive value, otherwise it is negative. If there is no record, then this is indicated by a zero. The ‘Elevation’ table records the elevation of natural ground surface around a bore or the reference point based on AHD or state datum (STD). When two elevation records for the same bore appeared, the most recent record was used. Thus, the water level represented as AHD is the sum of the water level in the ‘Water level’ table and the corresponding elevation in the ‘Elevation’ table. For the data to be deemed useful in the statistical analyses, they needed to be referenced relative to one datum. In this case, the AHD was used. Due to inconsistencies in data (being referenced to AHD, STD, and assumed datum (ASS)) and unknown quality and source of the elevations, the Australian 1-second DEM was used for referencing all elevation data.

New South Wales

Water level data for the NSW part of the Clarence-Moreton bioregion were obtained from the National Groundwater Information System (NGIS) groundwater database (Bureau of Meteorology, Dataset 1). Additionally, nine Metgasco monitoring bores with water level records from 2004 to 2006 were merged into the collated database (Metgasco, 2007). The sign convention for water level records in NSW is opposite to that used in the DNRM database (Bioregional Assessment Programme, Dataset 2). The water level in the NSW database is represented as the depth of water below the ground surface; a positive value was used for water level below the reference point. Elevations of bores are missing for many bores. To make the converted water level more consistent, all the elevations of bores were derived from the Australian 1-second DEM.

Last updated:
8 January 2018
Thumbnail images of the Clarence-Moreton bioregion

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