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Author Topic: Could we refill the Great Artesian Basin with floodwater?  (Read 1473 times)

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Could we refill the Great Artesian Basin with floodwater?
« on: April 05, 2012, 11:04:07 PM »
Could we refill the Great Artesian Basin with floodwater?
ABC Science

If we can tap the Artesian Basin to take water out, why can't we pump water back into it in times of flood?
It's a temptingly simple idea that in times of flood we can inject surplus water back into the Great Artesian Basin.
But while reinjection is technically feasible, the trick is to collect that water and inject it into the right locations, and the sheer size of the artesian basin makes that difficult, says Dr Vincent Post, from the National Centre for Groundwater Research and Training.
The Great Artesian Basin underlies 22 per cent of the continent stretching across Queensland to the south east corner of the Northern Territory, north east corner of South Australia and northern New South Wales.
But it is not just one big underground lake. The water is confined and pressurised within a massive geological formation of porous sandstone, known as an aquifer, where it flows and is stored in different ways.
When a bore is sunk in an aquifer, artesian water flows to the surface and can be extracted. But when looking for places to extract water, and for that matter to re-inject it, Post says its necessary to look for rock layers that have high storage capacity, but are also permeable enough to transmit the water.

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