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:

8 January 2018

Product Finalisation date

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