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  • Analysis of Murray Futures "Directions for a healthy future" report - Lakes Need Water
    in 1940 Long timeframes Over the next 20 years the long term plan for the region will work towards keeping freshwater in the Coorong Lower Lakes and Murray Mouth system The time frames are excessively long Artificially keeping freshwater in the Lakes is also at odds with climate change predictions for decreasing Murray Darling Basin flows and rising sea levels The report also glosses over the adverse socio economic impacts of not restoring water to the Lakes Communities are hurting now and cannot afford to wait decades Bio remediation unproven The secondary management techniques for bio remediation of acid sulphate soils are still the subject of experimentation to establish their effectiveness on the scale required There is no time to experiment Saturating acid sulphate soils with water is the only proven management option Freshwater is unavailable which only leaves seawater Aversion to seawater Seawater is seen as a last resort option Seawater has always been a natural part of the Lower Lakes An immediate transition to a permanent marine environment is not considered to be environmentally responsible The report does not explain why a marine environment is not responsible The likely tidal flow and means of flushing the system are not considered sufficient to support a healthy functioning marine ecosystem in the short to medium term It is anticipated that any increase in the tidal influence on the Coorong Lower Lakes and Murray Mouth will result in increased sand loading at the Murray Mouth which in turn will exacerbate issues associated with a blocked Murray Mouth This warrants scientific scrutiny Where are the models and data that support these claims It is equally feasible that barrages and channels could be modified to maximize tidal flows and minimize sand loading Other shallow estuarine lakes such as the Gippsland Lakes are healthy

    Original URL path: http://www.lakesneedwater.org/feature/murray-futures-directions-for-a-healthy-future-analysis (2016-02-09)
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  • Issues Paper - Key Points - Lakes Need Water
    any action taken or not taken will have a downside and involve a balance between competing needs The position of River Lakes and Coorong Action Group RLCAG is not tenable Read why Acidification resulting from exposure of acid sulphate soils to air would leave the Lakes ecologically sterile for decades Even with the return of freshwater the Lakes would be truly dead Salinity levels have increased such that the Lower Lakes are no longer a freshwater environment the water has been unsuitable for freshwater species and human use for a long time Dessication drying out is another immediate problem that is resulting in corrosive dust storms Freshwater seawater or no water If a freshwater solution is not possible the only alternatives are seawater or no water While an estuarine mix or a full seawater marine wetland environment would mean major changes to the ecosystems that were there before the drought already dying or dead a healthy estuarine ecosystem on the other hand would have value in its own right It would be different but not dead Scientific research into core samples of the sediment laid down in the bed of the Lakes over thousands of years show conclusively that the

    Original URL path: http://www.lakesneedwater.org/feature/issues-key-points-9-feb-2009 (2016-02-09)
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  • Subpages - Lakes Need Water
    Capt Sturt s Journal Dolphin at Tailem Bend Fencing on public land when is a fence a deathtrap for they were fishers Coorong for they were fishers Lakes History of the Lower Lakes and Coorong History of the Lower Lakes and Coorong with timeline Ian s Corner Issues Paper 9 February 2009 Issues Paper Key Points King Tides Lower Lakes Bathymetry Lower Lakes Local History Lower Lakes Recent Seawater Flow

    Original URL path: http://www.lakesneedwater.org/system/app/pages/subPages?path=/feature (2016-02-09)
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  • Environmental_Flows_Analysis - Lakes Need Water
    that included the Coorong From page 10 Key Issues The Scientific panel identified four key issues driving the serious degradation of environmental values in the Lower Lakes and Coorong These are the reduced area of the estuary changed water regimes of the lakes and river freshening of brackish and saline habitats reduced habitat for aquatic plants The first two issues are the most significant in terms of their impact and their influence in driving the other key issues From page 43 The reduction in the size of the estuary has reduced the size of the tidal prism by around 90 of its original pre barrage size In 1914 the lake area affected by tides was 97 3 km2 75 000 hectares with a spring tidal prism of 20 000 ML Walker 1990 These figures indicate that the original tidal prism produced a twice daily exchange of similar magnitude to the flows of 20 000 ML day for a month or more which would now be required to substantially clear the mouth of accumulated deposition Harvey 1988 From page 44 Opportunities for Improvement Options for rehabilitation measures to address the key geomorphological issues Long Term Enlarge the diversity of habitat in the estuary by increasing the size of the tidal prism and the flushing effects of tides at the mouth An option for management is to relocate the barrage system to Wellington or to Pt Sturt Pt McLeay From page 62 Ecological Needs The changes in water regime and the presence of the barrages have both led to a reduced extent of the estuarine system now approximately 11 of the former area Bourman ibid Along with the changes there has been an increase in the extent of the freshwater environment behind the barrages and an increase in the spatial and temporal

    Original URL path: http://www.lakesneedwater.org/more/reports/environmental_flows_analysis (2016-02-09)
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  • Open the barrages, 5 March 2009 - Lakes Need Water
    of seawater and freshwater over the course of their history when flows were low says spokesperson Trevor Harden If we truly had a choice of course everyone would prefer freshwater but if it is a choice between no water and seawater then seawater is the right choice for the Lower Lakes The Lakes Need Water group believes that the Lower Lakes issue has become a political football making it difficult to present clear and balanced scientific views Strident criticisms of temporary weirs and the use of seawater have outweighed commonsense Mr Harden says It is obvious that the barrages the biggest weirs of them all are keeping water levels low and preventing nature from taking its course Opening the barrages would let seawater mix with existing freshwater to create a healthy estuarine environment and give the Lakes a go Keeping the barrages closed will kill the Lakes with vast expanses of corrosive windblown sand already evident Mr Harden adds that much of what community action groups have been saying about the value of the Lower Lakes and Coorong wetlands is not disputed We all value this unique environment and deplore its destruction It comes back to whether there really is

    Original URL path: http://www.lakesneedwater.org/press/open-the-barrages (2016-02-09)
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  • No time for experiments, 22 June 2009 - Lakes Need Water
    by community group Lakes Need Water reveals that South Australians are overwhelmingly in support of letting seawater into the Lower Lakes with 80 polled in favour of opening the Barrages Water levels in Lake Alexandrina are now 1 7 metres below the full supply level and almost 1 metre below sea level If water levels drop a further 60cm which is predicted by February 2010 tens of thousands of hectares of acid sulphate soils will be exposed and become subject to acidification The South Australian Department for Environment and Heritage DEH states in its press release of June 15 that initial remediation attempts were too slow to deal with the scale of the problem we are now facing The dumping of fine limestone by crop dusters or aerial liming as it is known is still highly experimental The shallow and confined waters of Currency Creek and the River Finniss are not representative of the large expanses of Lake Alexandrina and Lake Albert A significant majority of South Australians 69 polled are also in favour of building the proposed temporary weir at Pomanda Island near Wellington There is also strong support outside of South Australia for opening the barrages at 75

    Original URL path: http://www.lakesneedwater.org/press/no-time-for-lower-lakes-experiments (2016-02-09)
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  • Newsletter April 2012 - Lakes Need Water
    thousands of years and for whom their waters are of deep spiritual significance In 2006 Ngarrindjeri groups came together to create the Ngarrindjeri Nation Yarluwar Ruwe Sea Country Plan 1 8MB PDF from which the following excerpts are worth highlighting Until the construction of the barrages saltwater mixed with fresh water and sometimes travelled great distances up the river and the ecosystems of the lakes and the river had depended on the mixing of saltwater and freshwater The barrages were built at the request of European landowners and without the consent of Ngarrindjeri people For the last 65 years we have witnessed the decline in the health wildlife and other resources of the lakes and the river made worse by the deliberate introduction of exotic species such as the European Carp and destructive farming practices such as dairy farming irrigation land clearing and cattle and sheep grazing Th ere is no acknowledgement of the impact of these devastating environmental changes on Ngarrindjeri access to traditional resources and the wider impacts on Ngarrindjeri life and culture It is worth reading the whole document to learn more Also read the latest Lakes Need Water feature Ngarrindjerri the first fishers of the Lower

    Original URL path: http://www.lakesneedwater.org/newsletters/newsletter-april-2012 (2016-02-09)
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  • Newsletter, February 2012 - Lakes Need Water
    Lower Lakes as part of a barrier estuary that had its evolution interrupted by the barrages Read more Responses due on the Murray Darling Proposed Basin Plan The Proposed Basin Plan of 2011 is a disappointment It does not address any of the issues we have been discussing here for the last three years The plan is based on averages and will not keep the Lower Lakes full of fresh

    Original URL path: http://www.lakesneedwater.org/newsletters/newsletter-february-2012 (2016-02-09)
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