2.1.3.2.1 Groundwater levels


A summary of the measured groundwater level data used in this analysis is in Table 11 . There are more observed data for Queensland than for NSW, and 94.5% of the records are from alluvial bores. Two histograms show the temporal distribution of the water level data (Figure 29 and Figure 30). In Queensland, most measurements were conducted between 1995 and 2012. However, there are two clusters of records for NSW: (i) between 1975 and 1985, and (ii) between 2000 and 2008. The groundwater level data (in metres with respect to AHD) were derived from groundwater depth measurements (in metres below ground surface) in the state databases together with the Australian 1-second DEM data.

Table 11 Summary of groundwater level records for bores in the Clarence-Moreton bioregion

Bores with different screen codes have been counted separately.


Major stratigraphic unit

Number of records: I

Number of records: T

Number of records: B

Number of records: E

Number of records: BOI

Number of records: DS

Number of records: DM

Total

Time period

Alluvium

8,123

3,778

42

658

8,930

138,600

911

161,042

1901–2013

Main Range / Lamington Volcanics

260

4

165

45

0

183

1

658

1962–2013

Grafton Formation:

Rapville Member

112

0

48

21

0

0

0

181

1974–1987

Grafton Formation:

Piora Member

0

0

0

0

0

0

0

0

NA

Orara Formation:

Bungawalbin Member

0

0

0

0

0

0

0

0

NA

Orara Formation:

Kangaroo Creek Sandstone Member

0

0

0

0

0

0

0

0

NA

Walloon Coal Measures

3

0

0

0

1

1,225

8

1,237

1988–2013

Marburg Subgroup (undifferentiated)

2

14

1

45

188

3,331

302

3,883

1960–2013

Marburg Subgroup: Koukandowie Formation

0

0

0

0

0

323

593

916

1992–2013

Marburg Subgroup: Gatton Sandstone

0

370

0

0

0

768

28

1,166

1977–2013

Woogaroo Subgroup

1

0

28

40

0

1,270

21

1,360

1900–2013

NA = data not available

Screen codes are: (I) bores with screen intervals inside the aquifer; (T) bores with a screen top inside the aquifer; (B) bores with a screen bottom within the aquifer; (E) bores with screen intervals penetrating the entire aquifer; (BOI) bores with their bottom inside the aquifer although without screen information in the database; (DS) aquifer assignment for a bore sourced directly from the state database where the bore is only open to a single aquifer; (DM) aquifer assignment for a bore sourced directly from the state database where the bore is screened to multiple aquifers.

Data: Bioregional Assessment Programme (Dataset 4)

Figure 29

Figure 29 Histogram showing the temporal distribution of water level data in the in the Queensland part of the Clarence-Moreton bioregion

Data: Bioregional Assessment Programme (Dataset 5)

Figure 30

Figure 30 Histogram showing the temporal distribution of water level data in the NSW part of the Clarence-Moreton bioregion

Data: Bioregional Assessment Programme (Dataset 6)

Last updated:
11 July 2017
Thumbnail images of the Clarence-Moreton bioregion

Product Finalisation date

6 October 2016
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