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 16 3.3. Geology 3.3.1. Regional geology The study area comprises the southern half of the Bonney Well 1: 250,000 geological maps (Wyche & Simons, 1987) and the northern half of the Barrow Creek 1: 250,000 geological maps (Haines, Bagas, Wyche, Simons, & Morris, 1990). The WDWCD is located within the south-eastern edge of the southern part of the Wiso Basin and the north-western margin of the Georgina Basin. The interconnected Wiso and Georgina Basins collectively formed part of a vast depositional area that extended across northern, central and southern Australia. The limit of the Georgina and Wiso Basins is poorly defined by a basement high interpreted from regional geophysics. These neighbouring basins contain stratigraphic successions of similar age. The Wiso Basin is an east south-east trending Neoproterozoic to Palaeozoic intracratonic sag basin. About 80% of the basin, predominantly to the north, is very shallow, containing less than 300 m of middle Cambrian rocks. The main basin depocentre is the structurally-controlled Lander Trough along the southern margin, which includes a much thicker succession of Cambrian, Ordovician and Devonian rocks. These successions have been estimated to be up to 2,000-3,000 m thick and may reach a maximum of 4,500 m (Kruse & Munson, 2013). The main aquifers within the WCD are bounded to the north-east by the Davenport Province of the Tennant Creek Inlier and to the south-west by the Aileron Province of the Arunta Region. The basement geology consists of Wiso Basin Palaeozoic metasediments, Proterozoic Granites and the Hatches Creek Group of sandstone and volcanics. The Davenport Province to the north is a mildly deformed and metamorphosed, Palaeo- to Mesoproterozoic succession of siliciclastic metasedimentary and volcanic rocks. These unconformably overlie the Tennant Creek Inlier, a volcaniclastic and flysch sedimentary rock sequence which was intruded by granites and deformed by the Tennant Event at ~1850 Ma. The Arunta complex is a late Palaeoproterozoic to Ordovician succession of sedimentary, volcanic, and intrusive rocks interrupted by several tectono-thermal events (deformation, metamorphism, granite production) (Questa Australia Pty Ltd., 1994).