Border Rivers

Queensland Border Rivers Model Results to Support Basin Plan Requirements

Water Planning and Coastal Sciences

November 2018

Department of Environment and Science

Prepared by

Queensland Hydrology Water Planning and Coastal Sciences Science and Technology Division Department of Environment and Science GPO Box 2454 Brisbane Qld 4001

© The State of Queensland (Department of Environment and Science) 2018

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This document has been prepared with all due diligence and care, based on the best available information at the time of publication. The department holds no responsibility for any errors or omissions within this document. Any decisions made by other parties based on this document are solely the responsibility of those parties. Information contained in this document is from a number of sources and, as such, does not necessarily represent government or departmental policy.

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Citation

DES, 2018. Border Rivers – Queensland Border Rivers Model Results to Support Basin Plan Requirements, Queensland Department of Environment and Science, Brisbane.

November 2018

ii Hydrology Project Number: 416 000.PR/7

Contents

1 Introduction ...... 7 1.1 Current model 7 1.2 Proposed Model 7 1.3 Basin Plan Requirements 8

2 Border Rivers Source Model ...... 10

3 Model Scenarios ...... 11 3.1 Without Development Scenarios 11 3.2 With Development Scenarios 11 3.2.1 Current IGA/BDL IQQM Model 12 3.2.2 Current ROP IQQM Model 12 3.2.3 Proposed Source Water Plan Model 12

4 Reconciliation with Murray–Darling Basin Plan Schedule 3 ...... 15 4.1 Comparison of Flows for the IQQM and Source Without Development Scenarios 15 4.2 Comparison of Diversions to the Reference Scenarios 16

5 Conclusion ...... 19

6 References ...... 20

Appendix A – Flow Comparisons ...... 21

Appendix B – Mass Balance...... 27 Upstream extent of the Weir River to Talwood (416202a) 28 The Macintyre Brook to its confluence with the Dumaresq River 29 Upstream extent of the Dumaresq River to its confluence with the Macintyre Brook 30 Upstream extent of the Macintyre River to Holdfast (416012) 31 Dumaresq River downstream of the Macintyre Brook confluence and the Macintyre River from Holdfast (416012) to Goondiwindi (416201a) 32 Macintyre River and Barwon River from Goondiwindi (416201a) to Mungindi (416001) 33 The NSW Border Rivers floodplains including Boomi River and Whalan Creek 34

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List of tables

Table 1: Description of relevant model scenarios ...... 11 Table 2: Comparison of without-development flows between IQQM (BRI-806B) and Source (BRS- 181128A) ...... 16 Table 3: Simulated diversions under the current IGA, BDL, ROP, and proposed WP scenarios.... 17 Table 4: Long-term mean annual diversions from watercourses under water allocations and licences: comparison of BRI-0609U, BRI-1811B, BRI-0906E, BRI-1811B, BRS-181015A ...... 19 Table B.1: Water balance for the upstream extent of the Weir River to Talwood (416202a; and Yarrilwanna Creek near Talwood at node 0039) for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009 ...... 28 Table B.2: Water balance for the upstream extent of the Macintyre Brook to its confluence with the Dumaresq River for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009 ...... 29 Table B.2: Water balance for the upstream extent of the Dumaresq River to its confluence with the Macintyre Brook for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009 ...... 30 Table B.2: Water balance for the upstream extent of the Macintyre River to Holdfast (416012) for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009 ...... 31 Table B.2: Water balance for the Dumaresq River downstream of the Macintyre Brook and the Macintyre River from Holdfast (416012) to Goondiwindi (416201a) for model scenario BRS- 181015A over the model period 01/07/1895 to 30/06/2009 ...... 32 Table B.2: Water balance for the Macintyre River and Barwon River from Goondiwindi (416201a) to Mungindi (416001) for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009 ...... 33 Table B.2: Water balance for the NSW Border Rivers floodplains including Boomi River and Whalan Creek to its confluence with the Barwon River below Neeworra (416028a) for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009 ...... 34

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List of figures

Figure 1: The Border Rivers and Macintyre Brook Water Supply Schemes ...... 13 Figure 2: Water Management Areas in the Queensland Border Rivers ...... 14 Figure A.1: Comparison of modelled flow at Roseneath (416011) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration ...... 21 Figure A.2: Comparison of modelled flow at Goondiwindi (416201A) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration ...... 22 Figure A.3: Comparison of modelled flow at Talwood (416202A) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration ...... 23 Figure A.4: Comparison of modelled flow at Kanowna (416048) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration ...... 24 Figure A.5: Comparison of modelled flow at Mascot (416207A) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration ...... 25 Figure A.6: Comparison of modelled flow at Mungindi (416001) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration ...... 26

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Glossary

BDL Baseline Diversion Limit CEWH Commonwealth Environmental Water Holder BRI Border Rivers IQQM BRS Border Rivers Source IGA Intergovernmental Agreement ROP Resource Operations Plan SDL Sustainable Diversion Limit WAN Water Allocation Number WMA Water Management Area WP Water Plan WRP Water Resource Plan

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1 Introduction

The Border Rivers model was developed by using Source Model as a platform. A detailed background to the data used, methodology, calibration and validation of the model development is documented in the Border Rivers calibration report (DES 2018b).

1.1 Current model

In preparing a Water Resource Plan (WRP), Resource Operations Plan (ROP), or Water Plan (WP) under the Water Act 2000 (Qld), the State of Queensland develops hydrologic models to test management scenarios. The current plans, viz. the Border Rivers Water Resource Plan 2003 (the WRP) and the Border Rivers Resource Operations Plan May 2011 (the ROP), are underpinned by models developed in the Integrated Quantity Quality Model (IQQM) modelling platform.

The current ROP model for the Border Rivers also forms the basis for the audited Cap model which supports Cap Reporting requirements under the Murray–Darling Basin Agreement and in the transition to the Basin Plan Section 71 reporting.

1.2 Proposed Model

The Queensland Government has developed a new model for the Border Rivers as part of the review of the current WRP and ROP, and for the Water Plan package being developed to comply with Basin Plan requirements. This new model was developed in close collaboration with the NSW Office of Water.

The proposed Border Rivers Source Model was developed by using the eWater Source Modelling Platform (Carr & Podger 2012; Welsh et al. 2012). This hydrologic model simulates surface water quantity on a daily timestep. The full simulation period is from 01/07/1889 to 30/06/2009, which comprises a warmup period followed by an assessment period from 01/07/1895 to 30/06/2009. The modelled region includes the Border Rivers – the Barwon River upstream of Mungindi, the Macintyre River, and the Dumaresq River – and their tributaries in NSW and Queensland.

A detailed description of the data used, methodology, calibration and validation of the model is presented in the Border Rivers Catchment Source Model Calibration Report (DES 2018b). The new model differs from the current model on the following points:

 Updated Methodology – Queensland has updated the model methodology based on the lessons from previous model builds to improve the robustness of the model. This update has come from model application, internal and external audits and developments in technology. The updated methodology is addressed in Appendix A. A key driver for this update was so that the model could be used to determine the sustainable diversion limit (SDL) and the baseline diversion limit (BDL) consistent with the Basin Plan requirements i.e. Chapter 10 and Position Statement 3 C Method for Determining Take.

 Better Data – with every review more data becomes available. Longer records are available at all open streamflow gauges. New gauges including those on the Weir River at Mascot (416207A, 10/01/2007) and Jericho (416205A, 4/07/2002), and Callandoon Creek at Oonavale (416206a, 4/10/2005) have provided better understanding of the flows at key locations.

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 New Modelling Platform – for the new Border Rivers model Queensland has adopted the new eWater Source modelling platform. The eWater Source platform differs from IQQM in numerous ways (DES 2018a).

 Updated Water Allocations – there have been changes to water allocations between the current ROP model and the proposed WP model to reflect the transfer/sale of water allocations.

1.3 Basin Plan Requirements

The Basin Plan prescribes requirements that Queensland Border Rivers models need to address to meet accreditation. The key requirements are:

1) BDL – Baseline diversion limit of an SDL resource unit. The Baseline diversion limits are determined on the basis of development conditions specified in Schedule 3 of the Basin Plan, and generally include:  take from water courses  take from regulated river  take by floodplain harvesting  take by commercial plantation  take from basic rights. 2) The model estimates the quantity identified in Schedule 3 as the long-term annual average limit on the quantity of water that can be taken from the watercourse and from regulated rivers. The other forms of take are considered in the Water Accounting Methods Report (DNRM, 2019a in preparation). 3) SDL – Sustainable diversion limit of the Water Resource Plan area. The SDL is the long- term average sustainable diversion limit from a SDL resource unit as defined in Schedule 2 and 4 of the Basin Plan. Clause 10.10 of the Basin Plan specifies that the Water Resource Plan must set out the method for determining the maximum quantity of water that the plan permits to be taken for consumptive use during a water accounting period. This method may include modelling. For the Queensland Border Rivers SDL resource unit, Queensland prepared the Border Rivers Source Model to meet this requirement. As there are no SDL adjustment measures proposed for the Queensland Border Rivers, the difference between BDL and SDL is achieved by Commonwealth water recovery. 4) Annual actual take – Determination of annual actual take must be specified. As per clause 10.15 of the Basin Plan, the determination of the quantity of water, actually or estimated, taken for the consumptive use by each form of take from each SDL resource unit will be determined after the end of a water accounting period. The method used to estimate the quantities should be same as used to determine BDL and SDL. 5) Environmental water – Determination of the environmental water requirements of environmental assets and ecosystem functions. Clause 8.51, sub-sections (1) and (2) of the Basin Plan list a number of measures that may be used to determine the environmental water requirements of an environmental asset, and states that these methods may include a conceptual model. 6) SDL adjustment proposals – Models are an important tool for evaluating the SDL adjustment proposals. Chapter 7 of the Basin Plan states that the Authority can propose adjustments to the surface water SDLs if certain additional changes in infrastructure are proposed through the implementation of ‘supply measures’ and ‘efficiency measures’. Currently there are no SDL adjustment proposals in the Queensland Border Rivers. There may be a redistribution of the Northern Basin shared reduction under Chapter 7 of the

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Basin Plan, which could change the SDLs for each resource unit. This would be achieved by Commonwealth water recovery, which is reflected in the model.

Sections 10.22, 10.49 and 10.50 of the Basin Plan specify requirements that the WRP package should meet:

a) Section 10.22 states that a water resource plan must describe what was done to comply with the requirements mentioned in Part 4, Chapter 10 of the Basin Plan. b) Section 10.49 states that:  A water resource plan must be based on the best available information  The water resource plan must identify and describe the significant sources of information on which the water resource plan is based. c) Section 10.50 states that “A water resource plan must identify any significant method, model or tool that has been used to develop the water resource plan”.

This report covers the requirements outlined above.

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2 Border Rivers Source Model

The Border Rivers model was developed using the Source Model as a platform (Carr & Podger 2012; Welsh, et al., 2012). A detailed background to the data used, methodology, calibration and validation of the model development is documented in the Border Rivers calibration report (DES 2018b).

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3 Model Scenarios

This section describes several model scenarios which have been compared to highlight the similarities and differences between proposed Water Plan Source Model and the current IGA, BDL, and WRP IQQM models. A description of each scenario can be found in Table 1. All results in this report are provided for the Basin Plan period.

Table 1: Description of relevant model scenarios Case Simulation Model Name Platform Description Number Period Without Development BRI-806B Without IQQM A scenario with infrastructure and consumptive 1895–2009 Development extractions removed from the model to simulate IQQM Model predevelopment conditions. BRS-181128A Without Source A scenario with infrastructure and consumptive 1895–2009 Development extractions removed from the model to simulate Source Model predevelopment conditions. With Development BRI-0609U Current IGA IQQM This model was developed in IQQM to underpin 1890–2000 Model the Intergovernmental Agreement between (October) Queensland and New South Wales. BRI-1811B Current BDL IQQM As above, but extended to cover the Basin Plan 1895–2009 Model simulation period. (July) BRI-0906E Current ROP IQQM This model was developed in IQQM to underpin 1890–2000 Model the first-generation Water Resource Plan. (July) BRI-1811B Current ROP IQQM As above, but extended to cover the Basin Plan 1895–2009 Model simulation period. (July) BRS-181015A Proposed Source This model was developed in Source to 1895–2009 Water Plan underpin the second-generation Water Plans Source Model representing all of the Water Allocations and licences in the basin. The model corresponds to the draft second-generation Water Plan 2019.

3.1 Without Development Scenarios

Without-development cases have been developed to estimate the flow without any diversions (extractive or otherwise) using both the current calibration (BRI-806B) and the recalibration (BRS- 181128A). The modelled flows can be used as the baseline for evaluating the impact of various development scenarios on streamflow.

3.2 With Development Scenarios

The with-development cases simulate:

 Water Allocations, including allocations held by the Commonwealth Environmental Water Holder (CEWH), and allocations reserved by the state as unallocated water

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 Water Licences.

3.2.1 Current IGA/BDL IQQM Model

The current IGA IQQM model (BRI-0609U) was developed to underpin the New South Wales– Queensland Border Rivers Intergovernmental Agreement (the IGA). It simulates the 2008/09 level of development over the period 1890–2000. This model was previously extended to cover the Basin Plan modelling period 1895–2009 (as case number BRI-1811B) and was used for the purposes of estimating the Baseline Diversion Limits (BDL) in the development of the Murray– Darling Basin Plan.

3.2.2 Current ROP IQQM Model

The current ROP IQQM model simulates the maximum level of take allowed under the current Queensland Border Rivers WRP (2003) and ROP (2011). It does this by assuming full use of all entitlements, regardless of their historical utilisation. Two versions of this model are listed above: case BRI-0906E has a simulation period from 1890–2000 to align with the IGA modelling period, and case BRI-1811B has a simulation period from 1895–2009 to align with the BDL modelling period.

3.2.3 Proposed Source Water Plan Model

The proposed WP Source Model (BRS-181015A) was developed to simulate the maximum level of take allowed under the proposed Queensland Border Rivers Water Plan 2019 (DNRM 2019b).

This model is proposed to serve dual purposes as the Queensland Water Plan model, and as the Queensland BDL model for assessing compliance under the Basin Plan. The model simulates a period greater than the Basin Plan modelling period (1890–2009) and therefore satisfies the requirements of the Basin Plan with regard to the simulation period.

Storage Details and Assumptions

There are four major storages in the Border Rivers, which are included in the Proposed WP model:  Glenlyon Dam  Pindari Dam  Boggabilla Weir  Coolmunda Dam.

Additionally there are several smaller weirs, dams and waterholes which play minor roles and are also simulated.

Management Systems

The IGA defines the state-ownership of flows in the Border Rivers. These rules have been implemented in the proposed WP model using the ownership system in Source.

The subsequent management of the water owned by each state is achieved by several regulated and unregulated management systems operating simultaneously. For Queensland these management rules are defined in the proposed Queensland Border Rivers Water Plan 2019 (DNRM 2019b) and are included in the proposed WP model.

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The regulated water supply schemes in the Queensland Border Rivers are shown in Figure 1 and are as follows:  Border Rivers Water Supply Scheme (BRWSS)  Macintyre Brook Water Supply Scheme (MBWSS).

Figure 1: The Border Rivers and Macintyre Brook Water Supply Schemes

The unregulated water management areas in the Queensland Border Rivers are shown in Figure 2 as follows:  Border Rivers Water Management Areas (BRWMA)  Lower Weir River Water Management Area (LWRWMA)  Upper Weir River Water Management Area (UWRWMA)  Northern Weir River Water Management Area (NWRWMA)  Callandoon Creek Water Management Area (CCWMA)  Macintyre Brook Water Management Area (MBWMA)  Stanthorpe Water Management Area (SWMA; this scheme is explicitly modelled in the Granite Belt Source Model but not in the Border Rivers Source Model).

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Figure 2: Water Management Areas in the Queensland Border Rivers

Water User Demands

Licence information and demand assumptions for the water users in the proposed Water Plan Source model are detailed in the Queensland Border Rivers ROP Build Spreadsheet (DES 2018c) and the Queensland Border Rivers Scenario Assumptions Report 2019 (DES 2019).

Operational and Management Rules

These are described in a separate document. Please refer to the Border Rivers Management Rules Implementations Report (DPI and DES 2018).

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4 Reconciliation with Murray–Darling Basin Plan Schedule 3

The Basin Plan defines the sustainable diversion limits (SDLs) on water extractions within 29 surface water and 81 groundwater subareas (the SDL resource units) of the Murray–Darling Basin. The SDLs represent the maximum long-term average quantities of water that can be taken for consumption per year. In the case of the Queensland Border Rivers, the SDL will be met through water recovery by the Commonwealth.

The new Water Plan model (BRS-181015A) presented here represents the rules described in the Queensland Border Rivers Water Plan 2019 (DNRM 2019b, in preparation). This model has been developed with the capability of simulating the level of diversions allowed under the proposed Water Plan, and is proposed to be used to estimate an upper-limit on annual take to ensure ongoing Basin Plan compliance. This will form part of the Water Accounting Methods described in the Water Accounting Methods Report (DNRM 2019a, in preparation).

4.1 Comparison of Flows for the IQQM and Source Without Development Scenarios

The flow-calibration of the proposed Water Plan Source model has taken advantage of improved data and methods (DES 2018a). This has resulted in some differences between the modelled flows of the previous IQQM models and the proposed Source model. Table 2 below highlights the similarities and differences by comparing the without-development flows of the IQQM and Source scenarios (BRI-806B and BRS-181128A respectively).

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Table 2: Comparison of without-development flows between IQQM (BRI-806B) and Source (BRS- 181128A) Mean Flow [ML/d] Mean flow [ML/d] IQQM Without- Source Without- Relative Flow Location Development case Development case change (BRI-806B) (BRS-181128A) Dumeresq River at Roseneath - - (416011) 1,033 Macintyre Brook at Booba - 426 - Sands (416415a) Dumaresq River at Farnbro - 214 - (416310a) Macintyre River at Goondiwindi 2,564 2,587 +0.9% (416201a) Weir River at Talwood 349 347 −0.6% (416202a) Macintyre River at Kanowna 1,337 852 −36.3% (416048) Weir River at Mascot (416207a) 571 935 +63.7% Barwon River at Mungindi 1,607 1,602 −0.3% (416001)

The flows are comparable at most locations in the model, including the Macintyre River near Goondiwindi and Barwon River near Mungindi. There are notable differences in some areas, however. For example, the distribution of flows between the Lower Weir River (at Mascot 416207a) and the Macintyre River (at Kanowna 416048) has changed to reflect an improved understanding of the Weir River flows following the installation of streamflow gauges at Jericho (416205a) and Mascot (416207a) (see also Appendix A – Flow Comparisons).

4.2 Comparison of Diversions to the Reference Scenarios

Table 3 compares the long-term average diversion of the water allocations across the current IGA, BDL, and ROP scenarios and the proposed WP scenario. The proposed Water Plan scenario (BRS-181015A) presented simulate the accounting rules within the water plan and reproduces the diversions estimated under the previous ROP model (BRI-1811B).

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Table 3: Simulated diversions under the current IGA, BDL, ROP, and proposed WP scenarios

Current IGA Current BDL Current ROP Current ROP Proposed WP Type BRI-0609U BRI-1811B BRI-0906E BRI-1811B BRS-181015A (1890–2000) (1895–2009) (1890–2000) (1895–2009) (1895–2009)

Granite Belt

High Security 654 613 655 613 690

Unregulated 2,954 2,526 2,112 1,925 2,620

OLF/Licence 18,376 17,353 18,401 17,375 -

Unconverted - - - - 7,420

Unallocated 5,000 5,000 5,000 5,000 4,500

Macintyre Brook

High Security 487 487 487 487 466

General 15,724 14,473 15,724 14,473 15,448 Security General Security 5,580 5,564 5,580 5,564 5,908 DRIP Water - - 564 564 564* Harvesting

Dumaresq Macintyre Barwon River Irrigation

High Security 2,138 2,135 2,131 2,127 2,355

General 21,713 21,617 32,400 32,400 32,164 Security

Unregulated 109,992 106,418 99,263 96,524 98,199

Callandoon Creek (Unregulated)

5 m & 6 m 5,573 5,967 5,075 4,862 4,663 Unconverted 643 630 1,290

Weir River (Unregulated)

Northern - - 2,351 2,351 2,351* Weir

Upper Weir 24,514 24,404 16,959 16,873 16,293

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Current IGA Current BDL Current ROP Current ROP Proposed WP Type BRI-0609U BRI-1811B BRI-0906E BRI-1811B BRS-181015A (1890–2000) (1895–2009) (1890–2000) (1895–2009) (1895–2009)

Lower Weir 32,052 31,258 25,349 24,760 25,264

Little Weir 60 57 - - 61

Unconverted - - 7,258 6,732 11,031

OLF

OLF 11,879 11,707 16,273 15,850 14,566

Total (excl. DRIP)

Total 250,405 242,711 251,143 244,021 240,357

* Not modelled

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5 Conclusion

The proposed Queensland Water Plan model for the Border Rivers has benefitted from additional information that has become available to update the legislative models that support the Queensland Water Planning process and Murray–Darling Basin Plan requirements. The models have benefited from:  New climatic and streamflow data  Updated methodology.

The long-term mean annual diversions for the current IGA, BDL, WRP models and the proposed WP model are shown in Table 4. CEWH entitlements are identified separately to assist with demonstrating how the SDL will be achieved through Commonwealth water recovery in the Border Rivers SDL resource unit. For estimates of the BDL and SDL, please refer to the Water Accounting Methods Report (DNRM 2019a, in preparation), as these estimates are comprehensive and include forms of take and classes of water access right not considered in the models.

Table 4: Long-term mean annual diversions from watercourses under water allocations and licences: comparison of BRI-0609U, BRI-1811B, BRI-0906E, BRI-1811B, BRS-181015A Current IGA Current BDL Current ROP Current ROP Proposed WP Entitlement BRI-0609U BRI-1811B BRI-0906E BRI-1811B BRS-181015A Type (1890–2000) (1895–2009) (1890–2000) (1895–2009) (1895–2009) CEWH - - - - 14,600 entitlements Other 245,405 237,711 246,143 239,021 221,257 entitlements

Unallocated 5,000 5,000 5,000 5,000 4,500

Total 250,405 242,711 251,143 244,021 240,357

The new model demonstrates Queensland’s commitment to improve on the previous model’s robustness and defensibility. All future models will build on the new model and use the latest information, methodologies and technology available at the time when the new model is developed.

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6 References

Carr, R, Podger, G. (2012), eWater Source — Australia's Next Generation IWRM Modelling Platform, 34th Hydrology and Water Resources Symposium (December 2012), ISBN 978-1- 922107-62-6.

DES (2018a), Differences Between Source and IQQM Modelling, Queensland Department of Environment and Science, Brisbane.

DES (2018b), Border Rivers Catchment Source Model Calibration Report (Draft), Queensland Department of Environment and Science, Brisbane.

DES (2018c), Queensland Border Rivers ROP Build Spreadsheet, filename: “Border Rivers QLD ROP Build Sheet - Snapshot 28-11-2018.xlsx”, Queensland Department of Environment and Science, Brisbane.

DES (2019, in preparation), Queensland Border Rivers Water Plan Scenario Assumptions Report, Queensland Department of Environment and Science, Brisbane.

DNRM (2011), Queensland Border Rivers Resource Operations Plan 2011, Queensland Department of Natural Resources and Mines, Brisbane.

DNRM (2019a in preparation), Water Accounting Methods Paper for Queensland Border Rivers Water Plan, Queensland Department of Natural Resources and Mines, Brisbane.

DNRM (2019b in preparation), Queensland Border Rivers Water Plan 2019, Queensland Department of Natural Resources and Mines, Brisbane.

DPI and DES (2018), Border Rivers Source Model Management Rules Implementation Report, New South Wales Department of Primary Industries and Queensland Department of Environment and Science, Australia.

Queensland Government (2003), Water Resource Plan (Border Rivers) 2003, Office of the Queensland Parliamentary Council.

Welsh WD, Vaze J, Dutta D, Rassam D, Rahman JM, Jolly ID, Wallbrink P, Podger GM, Bethune M, Hardy M, Teng J, Lerat J. (2012), An integrated modelling framework for regulated river systems. Environmental Modelling and Software (2012), DOI 10.1016/j.envsoft.2012.02.022.

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Appendix A – Flow Comparisons

Figure A.1: Comparison of modelled flow at Roseneath (416011) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration

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Figure A.2: Comparison of modelled flow at Goondiwindi (416201A) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration

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Figure A.3: Comparison of modelled flow at Talwood (416202A) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration

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Figure A.4: Comparison of modelled flow at Kanowna (416048) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration

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Figure A.5: Comparison of modelled flow at Mascot (416207A) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration

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Figure A.6: Comparison of modelled flow at Mungindi (416001) – without development scenarios for previous (BRI-608B) and updated (BRS-181128A) calibration

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Appendix B – Mass Balance

Individual water balances have been prepared for seven areas covering the Qld and NSW Border Rivers catchment using the proposed WP model (BRS-181015A). These areas are:

1. Upstream extent of the Weir River to Talwood (416202a)

2. The Macintyre Brook to its confluence with the Dumaresq River

3. Upstream extent of the Dumaresq River to its confluence with the Macintyre Brook

4. Upstream extent of the Macintyre River to Holdfast (416012)

5. Dumaresq River downstream of the Macintyre Brook confluence and the Macintyre River from Holdfast (416012) to Goondiwindi (416201a)

6. Macintyre River and Barwon River from Goondiwindi (416201a) to Mungindi (416001)

7. The NSW Border Rivers floodplains including Boomi River and Whalan Creek.

The water balances, which are presented in tables below, summarize the water fluxes into and out of each area. The water balances demonstrate the relative significance of each component and show that all water is accounted for.

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Upstream extent of the Weir River to Talwood (416202a)

Table B.1: Water balance for the upstream extent of the Weir River to Talwood (416202a; and Yarrilwanna Creek near Talwood at node 0039) for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009

Water Balance Component Mean Annual Volume (ML/a)

Inflows

Flows from Upstream Reaches -

Inflows in this Reach 410,561

Major Storages

Change in Storage -

Net Evaporation -

Reaches and Waterholes

Change in Storage −52

Net Evaporation −27,492

Residual Losses −239,832

Diversions

Qld −24,683

NSW -

Outflows

End of System at Talwood (416202a) −110,422

End of System at Yarrilwanna Ck (node 0039) −18,079

Water Balance

Water Balance Error 0

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The Macintyre Brook to its confluence with the Dumaresq River

Table B.2: Water balance for the upstream extent of the Macintyre Brook to its confluence with the Dumaresq River for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009

Water Balance Component Mean Annual Volume (ML/a)

Inflows

Flows from Upstream Reaches -

Inflows in this Reach 128,126

Major Storages (Coolmunda Dam)

Change in Storage −198

Net Evaporation −10,297

Reaches and Waterholes

Change in Storage −2

Net Evaporation −2,958

Residual Losses −16,204

Unaccounted Losses −677

Diversions

Qld −15,082

NSW -

Outflows

Flow to the Dumaresq River – Macintyre Brook −82,707 Confluence Water Balance

Water Balance Error 0

29 Department of Environment and Science

Upstream extent of the Dumaresq River to its confluence with the Macintyre Brook

Table B.3: Water balance for the upstream extent of the Dumaresq River to its confluence with the Macintyre Brook for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009

Water Balance Component Mean Annual Volume (ML/a)

Inflows

Flows from Upstream Reaches -

Inflows in this Reach 558,576

Major Storages (Glenlyon Dam)

Change in Storage 227

Net Evaporation −12,032

Reaches and Waterholes

Change in Storage −17

Net Evaporation −22,880

Residual Losses −132,104

Diversions

Qld + NSW −13,012

Outflows

Flow to the Dumaresq River – Macintyre Brook −378,757 Confluence Water Balance

Water Balance Error 0

30 Hydrology Project Number: 416 000.PR/7

Upstream extent of the Macintyre River to Holdfast (416012)

Table B.4: Water balance for the upstream extent of the Macintyre River to Holdfast (416012) for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009

Water Balance Component Mean Annual Volume (ML/a)

Inflows

Flows from Upstream Reaches -

Inflows in this Reach 460,644

Major Storages (Pindari Dam)

Change in Storage 147

Net Evaporation −5,218

Reaches and Waterholes

Change in Storage −4

Net Evaporation −10,144

Residual Losses −64,156

Diversions

Qld -

NSW −2,068

Outflows

Flow at Holdfast (416012) −379,201

Water Balance

Water Balance Error 0

31 Department of Environment and Science

Dumaresq River downstream of the Macintyre Brook confluence and the Macintyre River from Holdfast (416012) to Goondiwindi (416201a)

Table B.5: Water balance for the Dumaresq River downstream of the Macintyre Brook and the Macintyre River from Holdfast (416012) to Goondiwindi (416201a) for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009

Water Balance Component Mean Annual Volume (ML/a)

Inflows

Flows from Upstream Reaches 840,665

Inflows in this Reach 95,389

Major Storages (Boggabilla Weir)

Change in Storage −19

Net Evaporation −1,297

Reaches and Waterholes

Change in Storage −12

Net Evaporation −12,695

Residual Losses −108,605

Diversions

QldD −27,821

NSW −37,533

Outflows

Flow at Goondiwindi (416201a) −724,835

Flow to NSW Floodplain −23,237

Water Balance

Water Balance Error 0

32 Hydrology Project Number: 416 000.PR/7

Macintyre River and Barwon River from Goondiwindi (416201a) to Mungindi (416001)

Table B.6: Water balance for the Macintyre River and Barwon River from Goondiwindi (416201a) to Mungindi (416001) for model scenario BRS-181015A over the model period 01/07/1895 to 30/06/2009

Water Balance Component Mean Annual Volume (ML/a)

Inflows

Flows at Goondiwindi 724,835

Flows at Talwood (including Yarrilwanna) 118,502

Inflows in this Reach 165,004

Major Storages (none)

Change in Storage -

Net Evaporation -

Reaches and Waterholes

Change in Storage −39

Net Evaporation −10,504

Residual Losses −236,060

Diversions

Qld −140,704

NSW −111,841

Outflows

Flow at Mungindi (including Little Weir) −351,483

Flow to NSW Floodplain −157,710

Water Balance

Water Balance Error 0

33 Department of Environment and Science

The NSW Border Rivers floodplains including Boomi River and Whalan Creek

Table B.7: Water balance for the NSW Border Rivers floodplains including Boomi River and Whalan Creek to its confluence with the Barwon River below Neeworra (416028a) for model scenario BRS- 181015A over the model period 01/07/1895 to 30/06/2009

Water Balance Component Mean Annual Volume (ML/a)

Inflows

Flows from Upstream Reaches 180,947

Inflows in this Reach 196,520

Losses

Unaccounted Losses −195,559

Diversions

Qld -

NSW −5,660

Outflows

Return to Barwon River below Neeworra −176,248 (416028a) Water Balance

Water Balance Error 0

34