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Southern Perth Basin Groundwater-Resource Assessment Application of SWAMS and ESCP Models

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Southern Perth Basin Groundwater-Resource Assessment Application of SWAMS and ESCP Models Government of Western Australia Department of Water Looking after all our water needs Southern Perth Basin groundwater-resource assessment Application of SWAMS and ESCP Models Hydrogeological record series Report no. HG26 May 2009 Southern Perth Basin groundwater-resource assessment Application of SWAMS and ESCP Models Looking after all our water needs S Varma Water Resource Management Division Hydrogeological record series Report no. HG26 May 2009 Department of Water 168 St Georges Terrace Perth Western Australia 6000 Telephone +61 8 6364 7600 Facsimile +61 8 6364 7601 www.water.wa.gov.au © Government of Western Australia 2009 May 2009 This work is copyright. You may download, display, print and reproduce this material in unaltered form only (retaining this notice) for your personal, non-commercial use or use within your organisation. Apart from any use as permitted under the Copyright Act 1968, all other rights are reserved. Requests and inquiries concerning reproduction and rights should be addressed to the Department of Water. ISSN 1329-542X (print) ISSN 1834-9188 (online) ISBN 978-1-921549-53-3 (print) ISBN 978-1-921549-54-0 (online) Acknowledgement This report was prepared by S Varma of the Department of Water with the modelling support from N H Milligan (CyMod Systems) and A Druzynski. B Degens and P Wallace-Bell provided technical support on acid sulfate soils. E Hauck and C O’Boy jointly supervised the project. D P Commander provided review comments. Recommended reference The recommended reference for this publication is: Varma, S, 2009, Southern Perth basin groundwater-resource assessment: Application of the SWAMS and ESCP models, Department of Water, Government of Western Australia, Hydrogeological record series, Report no. HG26. Southern Perth Basin groundwater-resource assessment Hydrogeological record series, Report no. HG26 Contents Summary.................................................................................................................................vii 1 Introduction..........................................................................................................................1 1.1 Background ...............................................................................................................................1 1.2 SWAMS v2 model overview......................................................................................................3 Boundary conditions ................................................................................................................................4 Drainage ..................................................................................................................................................4 Recharge and evapotranspiration............................................................................................................5 Faults.......................................................................................................................................................5 Abstraction...............................................................................................................................................5 Calibration ...............................................................................................................................................6 Calibrated model parameters ..................................................................................................................6 1.3 Eastern Scott Coastal Plain model ...........................................................................................7 Model domain and grid ............................................................................................................................7 Layering and parameterisation ................................................................................................................8 Hydraulic properties.................................................................................................................................8 Overland flow domain..............................................................................................................................8 Lake Jasper and other wetlands..............................................................................................................8 Drains ......................................................................................................................................................9 Boundaries ..............................................................................................................................................9 Model calibration .....................................................................................................................................9 1.4 Assumptions and limitations in the models...............................................................................9 2 Groundwater-use constraints.............................................................................................11 2.1 Ecological water requirements................................................................................................11 2.2 Social water requirements.......................................................................................................11 2.3 Acid sulfate soils .....................................................................................................................12 2.4 Impact on other bore users .....................................................................................................12 3 Modelling scenarios...........................................................................................................13 3.1 Description of scenarios..........................................................................................................13 Current-use (base-case) scenario .........................................................................................................13 Current entitlements — scenario A........................................................................................................13 Meeting the ecological water requirements (optimisation) — scenario B...............................................14 Regional growth — scenario C ..............................................................................................................14 Regional growth and Water Corporation proposal — scenario D ..........................................................14 Reduced regional growth and Water Corporation proposal — scenario E.............................................14 Other inferred modelling results.............................................................................................................15 3.2 Groundwater recharge and effect of drier climate ..................................................................16 4 Modelling results................................................................................................................17 4.1 Predicted water-level decline ..................................................................................................17 Current entitlements (scenario A) ..........................................................................................................17 Optimisation (scenario B) ......................................................................................................................17 Regional growth (scenario C) ................................................................................................................18 Regional growth plus Water Corporation (scenario D)...........................................................................19 Reduced regional growth and Water Corporation (Scenario E).............................................................20 Effect of reduced rainfall recharge.........................................................................................................20 Summary of groundwater level decline at GDE reference sites.............................................................20 4.2 Reduction in groundwater discharge to rivers ........................................................................21 4.3 Impact on Blackwood River salinity ........................................................................................23 4.4 Groundwater-level declines at PASS sites .............................................................................25 4.5 Water-balance assessment.....................................................................................................25 Global water balance.............................................................................................................................25 Department of Water iii Hydrogeological record series, Report no. HG26 Southern Perth Basin groundwater-resource assessment Groundwater management unit (GMU) water balances.........................................................................27 4.6 Sustainable yield and allocation limit ......................................................................................27 5 Conclusions .......................................................................................................................29 6 Recommendations.............................................................................................................31 Reference...............................................................................................................................32 Glossary
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