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) Contents CloudGMS v 6.4.1. Hydraulic conductivity distribution ................................................................................. 78 6.4.2. Infiltration distribution .................................................................................................... 79 6.4.3. Root depth ................................................................................................................... 80 6.4.4. Calibrated steady state heads ...................................................................................... 81 6.4.5. Steady state water balance .......................................................................................... 82 6.4.6. Steady state sensitivity analysis .................................................................................... 83 6.5. Transient parameter estimation ........................................................................................ 83 6.5.1. Transient parameter estimation strategy ....................................................................... 83 6.5.2. PEST settings ............................................................................................................... 83 6.5.3. Simulation period for parameter estimation ................................................................... 83 6.5.4. Evapotranspiration parameters ..................................................................................... 83 6.5.5. Unsaturated zone parameters ...................................................................................... 83 6.5.6. Pumping data ............................................................................................................... 84 6.5.7. Transient objective function .......................................................................................... 85 6.6. Estimated transient parameters ........................................................................................ 85 6.7. Transient model performance ........................................................................................... 86 6.7.1. Model convergence ...................................................................................................... 87 6.7.2. Qualitative measures .................................................................................................... 87 6.7.3. Quantitative performance ............................................................................................. 88 7 Water balances ......................................................................................................................... 89 7.1. Introduction ...................................................................................................................... 89 7.1.1. MIKE SHE water balance utility ..................................................................................... 89 7.1.2. Units for the water balance ........................................................................................... 89 7.1.3. Total catchment water balance ..................................................................................... 89 7.1.4. Saturated zone water balance items ............................................................................. 89 7.1.5. Western Davenport water management zones ............................................................. 90 7.2. Natural scenario (SC0) water balances ............................................................................. 93 7.2.1. Total catchment water balance ..................................................................................... 93 7.2.2. Natural scenario total catchment saturated zone water balance ................................... 93 7.3. Sub-catchment SZ water balances .................................................................................. 94 7.3.1. SW zone saturated zone water balance ........................................................................ 94 7.3.2. Central zone SZ water balance ..................................................................................... 95 7.3.3. NE zone SZ water balance ........................................................................................... 95 7.4. Sub-catchment storage estimates .................................................................................... 96 7.4.1. Total saturated zone storage ........................................................................................ 96 7.4.2. Economic storage volume ............................................................................................ 96 8 Sensitivity analysis ..................................................................................................................... 98 8.1. Transient sensitivity analysis ............................................................................................. 98 9 Predictive scenarios ................................................................................................................ 100 9.1. Pumping scenarios ......................................................................................................... 100 9.2. Groundwater level impacts ............................................................................................. 100 9.3. Central zone SZ water balance ....................................................................................... 104 9.4. Storage depletion ........................................................................................................... 105 9.4.1. Total aquifer storage depletion ................................................................................... 105 9.4.2. Storage depletion of economically accessible volume ................................................. 105 9.5. Definition of sustainability with respect to the Western Davenport WCD .......................... 105 9.5.1. Groundwater sustainability ......................................................................................... 105 9.5.2. Water allocation planning policy framework ................................................................ 106 9.5.3. Groundwater sustainability metrics ............................................................................. 106 9.6. Impacts to existing users ................................................................................................ 106 9.6.1. Surface water diversions ............................................................................................ 106 9.6.2. Groundwater access .................................................................................................. 106