WaterNSW is preparing for the possibility of a dam spill in the Murrumbidgee as rain sees dams nearly double in volume over August.
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Burrinjuck Dam on the Murrumbidgee River has increased from 46 per cent capacity to 82 per cent in a matter of weeks after receiving 430,000 megalitres of inflow in August.
Blowering Dam on the Tumut River is at 72 per cent capacity.
The dams are approaching similar capacity to August 2016 when Burrinjuck was at 89 per cent and Blowering at 83 per cent.
That year, the dams spilled in September.
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System operations executive manager Adrian Langdon said WaterNSW was working closely with the Bureau of Meteorology to assess whether to make flood mitigation pre-releases.
"As dam managers we are mindful that we cannot make releases to create airspace capacity to absorb inflows without a high degree of certainty that the anticipated inflows will replace those releases, and therefore not impact adversely on long term water security," he said.
The Burrinjuck catchment looks most likely to require attention, with in-flows peaking at about 100,000 megalitres a day in mid-August.
Mr Langdon said without the dam, the Murrumbidgee Valley would already be flooding.
The Bureau of Meteorology's spring outlook suggests there is more rain to come, with above average rainfall predicted for most of eastern Australia.
Across the Riverina, there is an 80 per cent change of above median rainfall from September to November, with a 75 per cent chance of at least 100 millimetres falling through spring across the region.
