Source Adoption in Northern : A Hydrological Model of an Integrated Goulburn, Broken, Campaspe, Coliban and Loddon Rivers System

DELWP, Victoria, Australia Dr Yong Li Dr Uttam Manandhar Seker Mariyapillai Outline of Presentation

1. Introduction & Background

2. Source Goulburn, Broken, Campaspe, Coliban and Loddon (GBCCL) Model Development

3. Model Results and Discussion

4. Conclusions and Recommendations

2 Goulburn, Broken, Campaspe Coliban & Loddon Implementation Catchment

HEADWORKS Nillahcootie Lake Eildon Goulbourn Weir Waranga Basin Approximate GBCCL model boundary Greens Lake Upper Coliban Storages Cairn Curran Tullaroop Reservoir Laanecoorie Reservoir

3 Schematic Representation of GBCCL Water Grid

Water supply system: 1 Goulburn 2 Broken

3 Campaspe

4 Coliban

5 Loddon 6 WWC & EGM 6 3 Legend: 2

5 4 1

4 Daily Time Step Source GBCCL Model

Reedy Swamp

Greens Lake

Winton Wetlands

Waranga Basin Doctors Rain Rejection Swamp Storage Goulburn Weir

Spring Gully Reservoir Loddon

Laanecoorie Reservoir Sandhurst Reservoir Caledonia Reservoir

Lake Barks Ck Eppalock Reservoir Cairn Curran Lake Centenary Reservoir Nillahcootie Reservoir Tullaroop McCay Talbot Reservoir Reservoir Reservoir Lake Eildon Evansford Reservoir Campaspe Weir Coliban 5 Upper Coliban Storages What is Modelled Physical processes Management processes Stream inflows o System management & operating rules  Storage operating rules 4 Water storages  Multiple sources of supply 2 Weir  Supplement rules  Bidirectional flow River/channel o Water sharing between water corps capacity constraints  Four ownership systems 5 Ecological assets o Water accounting and resource assessments 3 Irrigation Flow routing & /rural demands travel times  Five annual accounting resource assessment systems (RASs)  Carryover rules System losses  Spill rules

2 Urban demands o Urban restrictions o Wetland modelling 1 Minimum flow requirements /environmental demands o Demand ordering priority 6 Model Results: Goulburn Sub-system (1) Modelled vs Observed Storage Volumes / River Flows

Lake Eildon Storage Volumes

Goulburn River Flows at McCoy’s Bridge (405232) 7 Model Results: Goulburn Sub-system (2) Modelled vs Historical Seasonal Determinations (SDs)

High-Reliability Water Share (HRWS) SDs

Low-Reliability Water Share (LRWS) SDs 8 Model Results: Campaspe Sub-system (1) Modelled vs Observed Storage Volumes / River Flows

Lake Eppalock Storage Volumes

Campaspe River Flows at Rochester (406202) 9 Model Results: Campaspe Sub-system (2) Modelled vs Historical Seasonal Determinations (SDs)

High-Reliability Water Share (HRWS) SDs

Low-Reliability Water Share (LRWS) SDs 10 Model Results: Loddon & Broken Sub-systems Modelled vs Observed Storage Volumes / River Flows

Cairn Curran Reservoir Storage Volumes Lake Nillahcootie Storage Volumes

Loddon River Flows at Appin South (407205) Broken River Flows at Orrvale (404222) 11 Conclusions and Recommendations

1. A planning model with complex annual accounting RASs 2. Model performance generally provides a good agreement with the historical records & the existing monthly GSM results 3. A key pillar of Victoria's transition from REALM to Source 4. Demonstrated Source can be a “fit-for-purpose” modelling tool 5. Further improvements o Extension of the model input data o Incorporation of temporary trade o Improvement of distribution losses o Representation of non-consumptive demands o Modelling of irrigation and environmental demands

12 Thank You!

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