FINNISS – Construction of the proposed Finniss regulator has been deferred, but the Alexandrina Council wants to see it abolished completely.
The State Government announced last Friday that the decision to construct a third regulator in the Goolwa Channel would be reviewed at the end of summer.
Two temporary regulators are currently in place near Clayton and at the mouth of Currency Creek.
The regulators have created a pool of water in the Goolwa Channel in a bid to manage the risk of acidification.
However, recent rainfall means there is less threat of this occurring in the Finniss River over summer.
The Minister for the River Murray, Karlene Maywald, said Currency Creek posed a much higher risk of acidification than the Finniss River.
“Last summer, Currency Creek disconnected from the Goolwa Channel,” she said.
“This did not occur for the Finniss River and…because of recent rainfall and inflows, it retains much of its capacity to neutralise acidification risks.”
However, the Alexandrina Council wants the government’s promise that no more regulators will be constructed in the river system.
“I’m still worried by the government’s wording that ‘at this stage’ they see no need…but we don’t see any need at all for another regulator,” environment and economic development manager Graham Webster said.
“The Finniss River is well supplied by aquifers and streams during the year. The government could be spending its money more wisely elsewhere.”
Alexandrina Mayor Kym McHugh agreed, claiming the risk of acidification has been alleviated.
“There is no need for the other regulator to be built at Finniss, and I think the minister would be happy to hear us supporting that view,” he said.
The council plans to write to the government and restate its view that it sees no need for more regulators or weirs in the river system.
Mrs Maywald stressed that the regulators are temporary structures and will be removed once the threat of acidification has passed and freshwater flows are improving.
Meanwhile, an operation to pump water from Lake Alexandrina into the Goolwa Channel has been scaled back as water levels continue to rise.
As of last Tuesday only one of the three large capacity pumps on the Clayton regulator remains operating, as the Goolwa Channel pool levels creep closer to the target of 0.7 metres above sea level.
They were originally expected to pump continuously for eight to 12 weeks, but have only been operating since mid-September.
“The good news is that right now the water level is up to 0.63 metres, we’ve pumped 19 gigalitres, and have seven centimetres to go,” Richard Brown from the Department of Water, Land and Biodiversity Conservation (DWLBC) said.
“But what we won’t do is turn off the pumps completely as soon as gauges reach 0.7.
“We need to make sure all the seepage into the groundwater has occurred, so we know that the levels have stabilised.”
The DWLBC plans to pump a total of 27.5 gigalitres of water from Lake Alexandrina into the Goolwa Channel to help manage acid sulphate soils by keeping them wet.