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) Predictive Scenarios CloudGMS 104 9.3. Central zone SZ water balance The impacts of the pumping scenarios considered can be assessed using changes to the saturated zone (SZ) water balance. The central zone average annual SZ water balance components determined for each of the scenarios are presented below in Table 34. The results are also presented graphically in Figure 9-4. Table 34 Average annual SZ water balance components for the Central Zone for the period 1970 - 2016. Component SC0 SC3 SC4 Total Vol. [GL] Ave. Annual Vol. [GL/yr] Total Vol. [GL] Ave. Annual Vol. [GL/yr] Total Vol. [GL] Ave. Annual Vol. [GL/yr] qrech -4361 -95 -4267 -93 -4223 -92 qolszpos 1836 40 1739 38 1531 33 qolszneg -115 -3 -114 -2 -88 -2 qetsz 2134 46 1994 43 1535 33 qszin -143 -3 -145 -3 -195 -4 qszout 107 2 106 2 94 2 dszsto -173 -4 -279 -6 -2898 -63 qszabsex 0 0 283 6 3827 83 qszdrin -193 -4 -193 -4 -192 -4 qszdrout 906 20 874 19 607 13 error -2 0 -2 0 -1 0 Figure 9-4 SZ water balance components for the central zone for the 3 scenarios considered. It should be noted that the evapotranspiration from the groundwater represented by the qetsz component reduces from 46.4 GL/yr for SC0 to 33.4 GL/yr for SC4, which is a decrease of ~30%. Comparing the storage change (dszsto) for SC4 indicates approximately 60% of the abstraction is met by storage in the aquifer resulting in drawdown of groundwater levels.