She also said 100pc of carry-over water will be available from September 1, as a result of small improvements in River Murray inflows during July.

While 300 gigalitres of inflows to the River Murray system were recorded during July, the majority was received in tributaries in New South Wales and Victoria.

"Unfortunately these inflows to interstate tributaries are not part of the water resource available for sharing between all the States," she said.

"The improvement to the shared resource during July was 35GL and South Australia's share of this is 12GL.

"At the moment, we are not seeing the rain falling in the areas that will contribute inflows to the shared resource, which is what we need for South Australia to have access to more water.

"The improved tributary flows have allowed NSW and Victoria to repay a debt to South Australia of 31gL relating to an unpaid allowance from the Lindsay River that was due last year.

"Although inflows are still well below long term averages, the 12gL and the repaid Lindsay River debt has provided us with a small amount of water to allocate to irrigation and to paying off our drought imbalance to NSW and Victoria, which now stands at 52gL," Ms Maywald said.