The Importance of Surface Water- Groundwater Interaction in Australia
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The Importance of Surface Water- Groundwater Interaction in Australia by Dr Richard Evans May 2010. i/wcms/110/01/papers/LWA GW SW Interaction 17052010. Groundwater- The Major Water Resource of the World. Approximate Use 50% Groundwater 50% Surface water

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The Importance of Surface Water- Groundwater Interaction in Australia by Dr Richard Evans May 2010

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Groundwater the major water resource of the world

The Importance of Surface Water- Groundwater Interaction in Australia

by

Dr Richard Evans

May 2010

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


Groundwater the major water resource of the world

Groundwater-The Major Water Resource of the World

Approximate Use

  • 50% Groundwater

  • 50% Surface water

    But about half of surface water is actually Groundwater

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


The world s fresh water

The World’s Fresh Water

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


Lwrrdc groundwater program

LWRRDC- GroundwaterProgram

What has the LWRRDC/LWA Groundwater Program Achieved?

  • A very small investment

  • Dryland salinity

  • Impact of grassed leguminous pastures on groundwater quality

  • Diffuse sources on groundwater quality

  • Introduced GDE’s

  • Raised profile of SW-GW interaction

  • Groundwater balances of Australia

  • Vegetation water use

  • Initial investment in the Centre for Groundwater Studies

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


Types of gdes

Types of GDEs

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


Groundwater the major water resource of the world

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


Response of ecosystem health to water regime

Response of Ecosystem Health to Water Regime

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


Groundwater surface water interaction

Groundwater-Surface Water Interaction

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


General principles of sw gw interaction

General Principles of SW-GW Interaction

  • Groundwater and surface water are usually interconnected and interchangeable

    • GW becomes SW, and SW becomes GW

  • Not recognised

    • Results in double accounting and double allocation

  • Not recognised because of long time lag

    • Commonly decades

      4.In some parts of Australia we have capped SW, but still drill a bore near a river and call it GW and get it licensed

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


Groundwater the major water resource of the world

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


Significance of double accounting in australia

Significance of Double Accounting in Australia

08/09:

  • Estimated use is 10,000 GL/yr (2,000 GL in MDB)

  • Double accounting is estimated at 25 to 50% of this use

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


When is double accounting important

When is Double Accounting Important?

  • Relative to mean annual stream flow, double accounting is usually very small

  • However double accounting is often important during the flow times of the year and during drought

  • Hence it is important for low flow planning- ie. environmental flow, drought water supply and security of supply to surface water users

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


Surface water ground water interaction where is australia at

Surface Water/ Ground Water Interaction-Where is Australia at?

  • Fundamental concepts still not grasped by key people eg. general denial

  • Drought has disguised effects of groundwater pumping on stream flow

  • Virtual complete absence of integral surface water and groundwater management across Australia

  • National Water Plan (announced January 2007) proposes groundwater to be included in new MDB Cap

    -silence, and a surge in new licence applications

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


Impact of the fellowship

Impact of the Fellowship

Influential in:

  • National Policy- NWC Second Bi Annual Assessment

  • MDB SDL

  • State Water Resource Assessments

  • Local licensing approvals and conditions

    But

    • Still challenged by many farmers, politicians

    • Sceptics alive and fighting

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


The future big questions in groundwater r d in australia

The Future Big Questions in GroundwaterR&D in Australia

Energy/Water Nexus in groundwater – honest economies of groundwater compared to the alternatives

Aquitard Behaviour- Kv and storage- focus not on aquifers, but more on the limiting factor, the aquitards

Recharge change due to climate change– complex and counter intuitive

Managed aquifer recharge

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


Urban groundwater ignored

Urban Groundwater Ignored

Broad Range of Issues:-

  • Excessive recharge

    • Flooding basements

    • Brackish groundwater intrusion into sewers

    • Managed aquifer recharge

    • Urban stormwater harvesting – no allocation ? Or prioritise

    • Lack of Bank storage schemes

    • Honest economies – including externalities

    • S & D use ignored

    • Over exploited coastal systems and sea water intrusion

i/wcms/110/01/papers/LWA GW SW Interaction 17025010


The overriding process is evapotranspiration

The Overriding Process is Evapotranspiration

  • Controls GDE, SW-GW Interactions, recharge and discharge change

  • Ultimately water management in the world will become ET management

    (Consumption based, not supply based)

i/wcms/110/01/papers/LWA GW SW Interaction 17052010


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