In Resources

Western Australia Minister for Water Bill Marmion

Diversion Weir Helps Lake System Recovery

Victor P Taffa

  • Protecting water resource health
  • Supporting internationally significant wetlands

A major milestone in the protection and rehabilitation of ecologically significant wetlands south of Mandurah has been achieved with the completion of a new diversion weir at Lake Mealup.

Water Minister Bill Marmion said the lake had suffered from problems with acidification, invasive species and reduced water levels from the drying climate.

“The diversion weir on the Mealup Drain is a key element of the Lake Mealup Recovery Program.” Mr. Marmion said.

“Changes in water quality and the reduced open water habitat have resulted in biodiversity degradation which has impacted on migratory bird numbers. By diverting the flow of water from the Mealup Drain and Harvey Estuary into Lake Mealup, the diversion weir will help maintain the necessary lake water levels and improve water quality.”

The Department of Water has been working with the Department of Environment and Conservation; Water Corporation; the Peel Harvey Catchment Council; Lake Mealup Preservation Society; and researchers as part of the Lake Mealup Recovery Program.

“This has been a truly collaborative effort by stakeholders to support the lake’s recovery and I congratulate everyone involved in this important community project.” the Minister said.

The recovery program, launched in 2010, aims to halt further degradation of the lake, restore its water quality and natural water cycle, increase open water habitat, reduce invasive species and attract more waterbird species to the lake. It also aims to maintain the wetland’s Ramsar listing.

The weir has been handed over to the Department of Environment and Conservation to operate.

Fact File

  • Lake Mealup is recognised as an internationally significant wetland under the United Nations Ramsar convention and listed in the Australian Heritage Commission’s Register of the National Estate as a place of important natural heritage
  • Key stakeholders in the Lake Mealup Recovery Program are the Department of Environment and Conservation; Department of Water; Water Corporation; Peel Harvey Catchment Council; Lake Mealup Preservation Society; Edith Cowan University; V&C Semeniuk Research Group; South West Land and Sea Council; and Gnaala Karla Booja Native Title Working Group
  • The project was delivered with funds from the State Government’s Natural Resource Management program through the Peel Harvey Catchment Council
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