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) Water Balance CloudGMS 96 is in a separate surface water catchment (Bonnie Creek). However, the results from this management zone could be scaled up to provide indicative values for the portion of the management zone not covered by the model, or alternatively the previous estimates could be scaled down to provide water balance values. The saturated water balance for the NE zone is presented below in Table 30. Table 30 NE zone SZ water budget components for the period 01/01/1970 01/01/2016. Component Vol. [GL] Ave Annual Vol. [GL/yr] Ave Annual Vol. [ML/yr] qrech -754 -16 -16401 qolszpos 385 8 8361 qolszneg -74 -2 -1601 qetsz 122 3 2648 qszin -2 0 -42 qszout 84 2 1821 dszsto 85 2 1850 qszabsex 0 0 0 qszdrin 0 0 0 qszdrout 154 3 3357 Error 0 0 -7 Error % 0.04 0.04 0.04 +ve values are losses to the system -ve values are gains to the system 7.4. Sub-catchment storage estimates 7.4.1. Total saturated zone storage The volume of groundwater stored in the saturated zone for each of the sub-catchments has been determined for the natural scenario (SC0) and are presented below in Table 31. The estimates are for layers 1-4 only as layer 5 represents the Proterozoic basement rocks. This was achieved by extracting an incremental storage balance for each zone using the Saturated Zone Storage layers water balance option and then subtracting the storage balance for layer 5 for each zone. Table 31 Total groundwater storage in aquifers within the southwestern, central and north-eastern subcatchment zones. Management Zone Area. [sq. km] Storage Depth [mm] Storage Vol. [GL] Southern western 4126 426 1758 Central 7991 17700 141500 North eastern 3464 426 1475 Total 7.4.2. Economic storage volume The previous section presented storage depletion for the entire saturated volume for the aquifer system of the central zone. The depth of economic extraction, however, is likely to be much less than