ANU Sustainable Farms

Supporting sustainable farming to help conserve Australia’s unique biodiversity.

ANU Sustainable Farms ANU Sustainable Farms
  • About Us
    • About Us
    • Our Research
    • Meet the team
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  • On the Farm
    • Introduction
    • Support biodiversity
    • Enhance farm dams
    • Establish shelterbelts
    • Enhance rocky outcrops
    • Protect and restore paddock trees
    • Riparian restoration
    • Protect remnant vegetation
  • Farmer Stories
    • Introduction
    • Tony and Vicky Geddes, Yallock
    • John and Nicole Hopkins, Allawah
    • Sam and Claire Johnson, Windermere
    • Paul and Rachel Graham, Bongongo
    • Marcus Richardson, Larakoona
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An initiative of the Australian National University
  • Introduction

    • Farm Dams Technical Guide

    • What is an enhanced dam?

    • Benefits of farm dam enhancement

  • Section 1: Water planning and dam decision-making

    • Introduction

    • Importance of farm water planning

    • Farm Water Planning Steps

    • Dam decision-making options

  • Section 2: Enhancing farm dams

    • Introduction

    • Considerations for choosing which dams to enhance

    • How to enhance a farm dam

  • Section 3: Optimising dam construction for multiple benefits

    • Introduction

    • Key features of a well-designed farm dam

    • Planning a new farm dam

    • Enlarging an existing dam

    • Dam maintenance and de-silting

  • Appendices and further info

    • Appendix 1: Planning a farm dam – a worked example

    • Appendix 2: Plant lists for revegetating farm dams

    • Further information

    • Acknowledgements

  1. Technical Guides
  2. Farms Dams Technical Guide
  3. Section 3: Optimising dam construction for multiple benefits
  4. Enlarging an existing dam

Enlarging an existing dam

Undertaking farm water planning can indicate a need for increased water storage capacity in the form of dams. Enlarging an existing dam – particularly one that may require maintenance to address other issues – can be a good way of achieving increased storage without building a new dam.

However, it is important to note that enlarging dams increases a farm’s water holding capacity, so may require a license depending on the regulations for your area.

For example, in NSW, dams on 1 st or 2 nd order streams can be enlarged as long as the farm remains within its harvestable rights. Dams on a 3 rd order stream that were built before 1999 are allowed to be maintained, but cannot be enlarged without a license.

A dam construction expert should be consulted before dam enlargement commences.



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Last update: February 28, 2023
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    Sustainable Farms is an Australian National University initiative supported by funding from the Australian Government’s National Landcare Program, as well as by philanthropic organisations and industry groups. We work closely with Landcare groups and NRM agencies in NSW and Victoria.

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    Help tackle the challenges of modern-day agriculture in south-eastern Australia. Support sustainable farming and help to conserve Australia’s unique biodiversity.

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    ANU Sustainable Farms acknowledges the Traditional Custodians of the land we work on and we pay our respects to their Elders, past and present.

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