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 13 3 Available data 3.1. Climatic data Climatic data are available at three rain gauges in the Western Davenport WCD (WDWCD) area. However, to ensure the continuity of data the SILO data drill was used to provide rainfall and evaporation data for this study. The SILO data site was located at Latitude, Longitude: -21.1500 134.3000 (Decimal Degrees), 2109'S 13418E Elevation: 448m. 3.1.1. Rainfall trends The SILO Data Drill rainfall data are presented in Figure 3-1 as annual totals with a trace of mass residual to show long-term trends in the rainfall record. The mass residual values show generally dryer than average conditions existing prior to 1970, and generally wetter than average conditions after 1970. Figure 3-1 Annual SILO rainfall totals with a trace of mass residual to show longer term trends in the rainfall (1900-2016). 3.1.2. Southern oscil lation index (SOI) The Southern Oscillation Index (SOI) shows sustained positive values over +8 on 6 occasions since 1970 (Figure 3-2), which correspond to La Nina events and higher rainfall years seen in Figure 3-1. These events lead to appreciable recharge to the aquifers via direct infiltration through the soil and as infiltration along drainage from surface water flows.