2.1.3.2.2 Hydraulic conductivity


Most records in the pumping test database do not have an entry for hydraulic conductivity. The hydraulic conductivity was derived from the pumping test data by a two-step method to support the groundwater modelling: (i) transmissivity was estimated from the original test readings using the TGUESS approach and (ii) hydraulic conductivity was calculated based on the estimated transmissivity and the extracted screen information. The estimated hydraulic conductivity was mainly available for the alluvium and volcanics and varies across a range of six orders of magnitude (Table 12).

Table 12 Summary of hydraulic conductivity data for bores in the Clarence-Moreton bioregion

Bores with different screen codes have been counted separately.


Major stratigraphic unit

Number of bores: I

Number of bores: T

Number of bores: B

Number of bores: E

Number of bores: BOI

Number of bores: DS

Number of bores: DM

Total

Hydraulic conductivity range

(m/day)

Alluvium

107

21

1

5

19

40

0

193

0.090–1499.680

Main Range / Lamington Volcanics

25

1

7

7

0

1

0

41

0.079–152.02

Grafton Formation:

Rapville Member

4

0

1

1

0

0

0

6

3.841–75.765

Grafton Formation:

Piora Member

5

0

0

0

0

0

0

5

0.213–25.900

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

5

1

0

1

0

0

0

7

0.486–17.220

Marburg Subgroup (undifferentiated)

2

1

0

3

0

2

0

8

0.027–5.752

Marburg Subgroup: Koukandowie Formation

0

0

0

0

0

NA

NA

0

NA

Marburg Subgroup: Gatton Sandstone

1

0

0

0

0

1

0

2

1.099–4.918

Woogaroo Subgroup

1

0

2

4

0

4

0

11

0.008–23.857

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 8, Dataset 9, Dataset 17)

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

Product Finalisation date

6 October 2016
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