Territory Stories

Development of a Groundwater Model for the Western Davenport Plains

Details:

Title

Development of a Groundwater Model for the Western Davenport Plains

Creator

Knapton, Anthony; CloudGMS Pty Ltd

Commissioned by

Northern Territory. Department of Environment, Parks and Water Security

Collection

E-Publications; E-Books; PublicationNT; WRD Technical Report 27/2017

Date

2018-03

Location

Western Davenport Water Control District

Abstract

CloudGMS has been commissioned by DENR to develop a numerical groundwater model of the aquifers within the central area of the WDWCD to improve confidence in the sustainability of the groundwater resources, as this is the area within the WCD with greatest potential for intensive development.

Notes

Made available by via Publications (Legal Deposit) Act 2004 (NT); Prepared for Dept Environment and Natural resources

Table of contents

Executive summary -- 1 Background -- 2 Physical -- 3 Available data -- 4 Conceptual model -- 5 Model design & construction -- 6 Parameter estimation -- 7 Water balances -- 8 Sensitivity analysis -- 9 Predictive scenarios -- 10 Conclusions -- 11 Reference -- 12 Document history and version control -- Appendix A - Groundwater level hydrographs - Appendix B - Alek range horticultural farm sub-regional modelling

Language

English

Subject

Groundwater; Northern Territory; Western Davenport Water Control District; Conceptual mode

Publisher name

Northern Territory Governmnet

Place of publication

Palmerston

Edition

version 2.0

Series

WRD Technical Report 27/2017

Format

ix, 127 pages : colour illustration and maps ; 30 cm

File type

application/pdf

ISBN

9781743502976

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/

Related links

https://hdl.handle.net/10070/842058 [LANT E-Publications: Development of a Groundwater Model for the Western Davenport Plains, version 1.1]

Parent handle

https://hdl.handle.net/10070/858845

Citation address

https://hdl.handle.net/10070/858846

Page content

Western Davenport WCD Groundwater Model (v2.0) Available Data CloudGMS 29 The geological units assigned to each of the hydrostratigraphic units and the rationale are described below: Basement rocks of the Archean granites, Hatches Creek Group and Mount Stuart have been designated as the basal hydrostratigraphic unit (HSU5). In the Georgina Basin the Middle Cambrian Chabalowe Fm has been designated as a hydrostratigraphic unit (HSU4). Laterally the Tomahawk beds are interpreted to be equivalent in age to the lower Hanson River beds and based on lithological characteristics may be equivalent to Unit 2 (Kennewell & Huleatt, 1980). The Upper Cambrian units within the Wiso and Georgina basins have been combined into a laterally extensive hydrostratigraphic unit (HSU3). o In the Georgina Basin the Arrinthrunga Fm and Tomahawk Fm have been combined into a single hydrostratigraphic unit based on similar lithological characteristics. o In the Wiso Basin the Hanson River beds and Hooker Creek Fm have been combined into a single hydrostratigraphic unit based on similar lithological characteristics. The Devonian aged Dulcie Sandstone and Lake Surprise Sandstone have been combined into a single hydrostratigraphic unit (HU2). The Cenozoic sediments are designated as a separate hydrostratigraphic unit (HU1). These units are generally well cemented. Water in these formations is primarily associated with secondary permeability due to interconnected joints and faults. Primary permeability is found in ferruginised horizons. 3.5.6. Groundwater flow system The hydrogeology of the Western Davenport Basin has been simplified into a series of horizontally layered sedimentary units. Whilst the stratigraphic units exhibit slightly different hydraulic properties, groundwater in the saturated zone is assumed to move readily within and between the units. There are no known aquitards or structural limitations on groundwater flow in the basin.