Jennifer Marohasy

a forum for the discussion of issues concerning the natural environment

Information

The Native Fish Strategy for the Murray Darling Ten Years On (Part 1)

By

IT is ten years since the launch of the ‘Native Fish Strategy for the Murray Darling Basin 2003-2013’ [1]. Hundreds of millions of dollars have been spent on the program including to re-snag the main channel of the Murray River with microchip embedded logs, building fish-ways and of course returning hundred of gigalitres of water. All of these initiatives should have helped restore populations of native fish, the objective of The Strategy. Native Fish Strategy Cover

In January I asked the Murray Darling Basin Authority, MDBA, if there would be a formal assessment of the effectiveness of The Strategy ten years on. It was suggested that I consult Edition 34 of RipRap, a publication of the Australian River Restoration Centre dedicated to highlighting many of the achievements of The Strategy. [Read more…] about The Native Fish Strategy for the Murray Darling Ten Years On (Part 1)

Water Levels in the Swan River Estuary: A Personal Observation

By

I READ with interest an article in The Fremantle Herald newspaper in which global warming was blamed for rising sea levels, which in turn were said to be submerging the mud flats in the Swan River estuary and thus destroying the habitat of migratory birds.

Reading it, I could not but reflect on my own observations of water levels and on the accretion and erosion of mud banks in the Swan River over my life-time. I have known the river intimately since the early 1940s when as a toddler I first paddled in the waters of Freshwater Bay. Over the years I have swum and fished in, and canoed, rowed and sailed on the river. I have cycled around the riverside paths, explored the river’s shores and bushland, walked my dogs at the river’s edge, and enjoyed the wildlife – some of which (like the river cobbler) seems to have disappeared, while other species (like the black swans) appear to be flourishing. I have known the river from Preston Point at East Fremantle to the Perth Causeway and beyond for over 60 years, and since 1980 I have swum regularly at the old Bicton Baths.

Over all this time I have seen the river rise and fall with the ocean tides, respond to flood waters coming down from the Avon, and fill to its brim with the run-off from heavy rain storms. But I have also seen the Point Walter sand spit so far above the water that it has grown a small-vegetated island. And only last summer there were occasions when the water was so low at Bicton Baths that the bottoms of the swimmers’ ladders were exposed and there were acres of temporarily exposed mudflats west of Alfred Cove and along the Como foreshore.

[Read more…] about Water Levels in the Swan River Estuary: A Personal Observation

Expensive Water Still in Dams: Barnaby Joyce

By

Media Release

850 billion litres of water purchased through Federal Government buybacks has not been used according to an Australian Audit Office report, Commonwealth Environmental Watering Activities, released today.

This is despite the Federal Government not expecting to acquire even half the Murray Darling Basin water it has deemed necessary for environmental watering purposes.

The Australian Government has bought an asset with borrowed money that the government does not know what to do with. This is a business plan very similar to that of the NBN. We are borrowing money from overseas to put people out of business, to make it harder to repay the money that Labor has borrowed.

850 billion litres is more water than what is in Sydney Harbour and was bought at taxpayer expense for billions of dollars. This unused water has simply served to deplete the economic base of rural communities, cut jobs and food production.

It begs the question of whether the Federal Government will attempt to find ways to utilise this water. Will consideration be given to ensure this water is used for the most environmental and economic benefit and not exacerbate flood events?

Regardless, for the Murray Darling communities deprived of billions of dollars worth of productive capacity, this water is just another example of Labor Government waste.

Barnaby Joyce

Dam Building in Singapore

By

MANY South Australians, and the Australian government, and the Murray Darling Basin Authority, claim that it is necessary to have barrages across the bottom of the Murray River because of the upstream irrigation industries [1]. There is no equivalent large-scale irrigation in Singapore, but they have barrages across the Marina channel. Marina barrages Singapore

In Singapore, unlike Australia, the government freely admit that the barrages have dammed the estuary to create a freshwater reservoir. Such refreshing honesty.

Singapore is a tiny country with not much freshwater [2]. An official website explains [3]:

“Built across the mouth of the Marina Channel, the Marina Barrage creates Singapore’s 15th reservoir, and the first in the heart of the city. With a catchment area of 10,000 hectares, or one-sixth the size of Singapore, the Marina catchment is the island’s largest and most urbanised catchment. Together with two other new reservoirs, the Marina Reservoir increased Singapore’s water catchment from half to two-thirds of the country’s land area in 2011.”

“As the water in the Marina Basin is unaffected by the tides, its water level will be kept constant all year round. This is ideal for all kinds of recreational activities such as boating, windsurfing, kayaking and dragonboating…”

And this blog post is to reintroduce you to the revamped Myth and the Murray website that includes more information about the River Murray barrages … www.mythandthemurray.org

[Read more…] about Dam Building in Singapore

Haven’t Lost Half of the Great Barrier Reef: Part 2, Junk Methodology

By

HOW could scientists conclude that half of the Great Barrier Reef has been lost in the last 27 years: target coral reefs most affected by cyclones, coral bleaching and crown-of-thorn starfish outbreaks, while ignoring more representative reefs with healthy corals. And I didn’t make that up! It’s documented in a peer-reviewed study by H. Sweatman, S. Delean and C. Syms entitled: ‘Assessing loss of coral cover on Australia’s Great Barrier Reef over two decades, with implications for longer-term trends’ [1].

Indeed the claim that there has been a 50 per cent decline in coral cover at the Great Barrier Reef appears to be largely an artifice of the survey method. In particular, coral reefs most severely affected by bleaching in 1998, and reefs disproportionally affected by crown-of-thorn starfish outbreaks, and also reefs with insufficient time to recover from cyclones in 2009 and 2011 were targeted for repeated sampling, while more representative reefs with healthy corals were ignored.

In part 1 of this series, I reported that the World Heritage Centre will demand action by the Australian Government to spend vast sums of taxpayers’ funds to address this manufactured issue, or have the Great Barrier Reef placed on its World Heritage in Danger List. This demand is a recommendation of the United Nation’s International Union for the Conservation of Nature, UNESCO, in its State of Conservation report prepared for the June meeting of the UNESCO committee [2], which in turn is based upon a report of the environmental lobby groups WWF and the Australian Marine Conservation Society, whose report [3] in turn relies on the claims of a peer reviewed study by Glenn De’ath and co-workers [4].Outer Barrier Reef, Photograph by Walter Starck

The paper by De’ath and co-workers published in the US Proceedings of the National Academy of Sciences in 2012 [5] does indeed claim a 50 per cent decline in coral cover based on 27 years of data from the Australian Institute of Marine Sciences (AIMS) Long-Term Monitoring Program. [Read more…] about Haven’t Lost Half of the Great Barrier Reef: Part 2, Junk Methodology