Google Earth catchment overlays
Clearfell logging of native forest in Melbourne’s water catchment is reducing Melbourne’s water.
Clearfell logging is permitted within four of Melbourne’s domestic water supply catchments, as shown in the image below. These catchments are:
- Thomson dam catchment.
(See current dam water levels on Melbourne Water website)
- Armstrong Catchment
- Starvation/ and McMahons Catchment
- Cement Creek Catchment.
However logging is reducing the water supply for 3.6 million people who live in Melbourne.
read the brass tap story telling how clearfell logging in the forested Melbourne water supply catchments is reducing water supply. Click on any of the taps in Google Earth to open a pop up box.
Water catchment overlays for Google Earth
Download overlay of Melbourne’s domestic water supply catchments that are subject to clearfell logging: cheap esomeprazole click here or on the map below.
Logging and water yield
The government’s own reports estimate that water yield would increase by more than 20,000 Mega litres in thirty years time if logging was banned in the Thomson water supply catchments. This increase is more water than what is used annually by a city the size of Ballarat or Bendigo!
Scientific research within the Melbourne water supply catchments has demonstrated that the young regrowth forests that grow after clearfell logging in wet high rainfall forests consume much more water than an old forest. Hence the practice of clearfell logging can significantly reduce water runoff in catchments for hundreds of years by converting older forests into young regrowth trees.
In the long term, the economic value of the water lost through logging is much greater than the value of the woodchips and timber.
In the Otways this water yield issue resulted in logging being banned within all of the Geelong domestic water supply catchments in 2002. For details on the logging/ water yield issue, see an old presentation used during the Otways campaign by the Otway Ranges Environment Network. See OREN water website archive.
The Victorian Government and native forest logging industry argue that only a small fraction of the forest is clearfell logged each year.
Most of the logging to date has targeted the high rainfall ash forests. For the Thomson catchment this has resulted in logging targeting the high rainfall upper slopes of Mt Baw Baw where ash forests naturally grow.
Ash forests cover more than half of all the combined catchments area and are the major contributor to the water supply; 80% of the water that goes to Melbourne falls in the ash forest part of the catchments.
Hence logging that targets ash forests is having the greatest impact on water supply.
Additionally, the practice of clearfell logging is converting the wet ash forests, that are naturally more fire resistant, into drier environments that are more fire prone. A big bushfire in the Melbourne water catchments is the greatest threat to water supply. See more details.
Who clearfell logs the catchments?
The Victorian Government permits logging in the Melbourne water catchment areas through VicForests. These areas are publicly owned; the Victorian Government, through Vicforests, manages them for the people of Victoria.
Most of the woodchipped forest in the catchment areas of Mt Baw Baw is sold to the nearby PaperlinX pulp & paper mill at Maryvale.and made into paper products like Reflex photo copy paper.
The PaperlinX pulp & paper mill is about 40 kilometres away from the Thomson catchment. See and measure this for yourself by downloading the location of the PaperlinX pulp & paper mill and setting the ruler/measure function in Google Earth to kilometres (Tools->Ruler>).
What needs to be done?
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In 2002 the Victorian government was elected with forest policies, it has acted on these - passing laws to ban all logging within the Geelong domestic water supply catchment in the Otways. This occurred because water was a big public issue for the people of Geelong, and the Government listened. This should happen again, this time for all of the Melbourne catchments.