Barwon Downs Technical Works Program Barwon Water
Total Page:16
File Type:pdf, Size:1020Kb
Barwon Downs Technical Works Program Barwon Water Integration Report FINAL REPORT 22 March 2017 Integration Report Barwon Water Integration Report Barwon Downs Technical Works Program Project No: IS129200 Document Title: Integration Report Document No.: IS129200-100 Revision: FINAL REPORT Date: 22 March 2017 Client Name: Barwon Water Client No: Project Manager: Louise Lennon Author: Louise Lennon File Name: J:\IE\Projects\03_Southern\IS129200\21 Deliverables\Integration report\Final report\Barwon Downs Integration Report FINAL REPORT.docx Jacobs Group (Australia) Pty Limited ABN 37 001 024 095 Floor 11, 452 Flinders Street Melbourne VIC 3000 PO Box 312, Flinders Lane Melbourne VIC 8009 Australia T +61 3 8668 3000 F +61 3 8668 3001 www.jacobs.com © Copyright 2017 Jacobs Group (Australia) Pty Limited. The concepts and information contained in this document are the property of Jacobs. Use or copying of this document in whole or in part without the written permission of Jacobs constitutes an infringement of copyright. Limitation: This report has been prepared on behalf of, and for the exclusive use of Jacobs’ Client, and is subject to, and issued in accordance with, the provisions of the contract between Jacobs and the Client. Jacobs accepts no liability or responsibility whatsoever for, or in respect of, any use of, or reliance upon, this report by any third party. Document history and status Revision Date Description By Review Approved DRAFT Preliminary draft report NU ,FD, LL LL LL DRAFT v2 13/09/2016 Draft report LL GH GH FINAL 25/11/2016 Final draft report LL SP SP FINAL 22/03/2017 Final report LL GH GH IS129200-100 i Integration Report Contents An important note about your report ................................................................................................................... 1 Executive Summary ............................................................................................................................................... 2 1. Introduction .............................................................................................................................................. 19 1.1 Barwon Downs region ............................................................................................................................... 19 1.2 History of the Barwon Downs borefield ..................................................................................................... 20 1.2.1 Borefield history ......................................................................................................................................... 20 1.2.2 Groundwater extraction ............................................................................................................................. 21 1.2.3 Licence history ........................................................................................................................................... 21 1.3 Current groundwater licence ..................................................................................................................... 23 1.4 Strategic drivers for the Barwon Downs technical works monitoring program .......................................... 23 1.4.1 Water security ............................................................................................................................................ 23 1.4.2 Community issues ..................................................................................................................................... 23 1.4.3 Informing the licence renewal .................................................................................................................... 24 1.5 Overview of the technical works monitoring program ............................................................................... 24 1.5.1 Monitoring program development .............................................................................................................. 24 1.5.2 The inter-relationships of the technical works monitoring program ........................................................... 26 2. Barwon Downs Study Area .................................................................................................................... 28 2.1 Surface water catchments ......................................................................................................................... 28 2.2 Rainfall ....................................................................................................................................................... 30 3. Technical Works Monitoring Program .................................................................................................. 32 3.1 Groundwater levels.................................................................................................................................... 32 3.1.1 Objective .................................................................................................................................................... 33 3.1.2 Approach ................................................................................................................................................... 33 3.1.3 Key Findings .............................................................................................................................................. 33 3.1.4 Recommendations..................................................................................................................................... 35 3.2 Surface water flow ..................................................................................................................................... 37 3.2.1 Boundary Creek (Barwon River Catchment) ............................................................................................. 37 3.2.1.1 Objective .................................................................................................................................................... 39 3.2.1.2 Approach ................................................................................................................................................... 39 3.2.1.3 Key Findings .............................................................................................................................................. 42 3.2.1.4 Recommendations..................................................................................................................................... 43 3.2.2 Gellibrand River ......................................................................................................................................... 44 3.2.2.1 Objective .................................................................................................................................................... 44 3.2.2.2 Approach ................................................................................................................................................... 44 3.2.2.3 Key Findings .............................................................................................................................................. 45 3.2.2.4 Recommendations..................................................................................................................................... 45 3.3 Aquatic groundwater dependent ecosystems (GDEs) .............................................................................. 47 3.3.1 Objective & Limitations .............................................................................................................................. 47 3.3.2 Approach ................................................................................................................................................... 47 3.3.3 Key Findings .............................................................................................................................................. 47 IS129200-100 ii Integration Report 3.3.3.1 Reach 1 ..................................................................................................................................................... 48 3.3.3.2 Reach 2 ..................................................................................................................................................... 48 3.3.3.3 Reach 3 ..................................................................................................................................................... 48 3.3.4 Recommendations..................................................................................................................................... 48 3.4 Terrestrial vegetation groundwater dependent ecosystems (GDEs) ........................................................ 49 3.4.1 Objective .................................................................................................................................................... 49 3.4.2 Approach ................................................................................................................................................... 50 3.4.3 Key Findings .............................................................................................................................................. 53 3.4.4 Recommendations..................................................................................................................................... 54 3.5 Potential acid sulphate soils (PASS) ........................................................................................................