Water NSW's Tony Webber confirmed that the rain provided about 10 gigalitres worth of additional inflow to the dam.

"It's really good news obviously at what is still a pretty low storage level," Mr Webber told the NVI.

"We certainly want a lot more before we can talk about making water more available for other users."

Read also:

Mr Webber said while availability for agricultural use wouldn't change, the extra inflow was a "welcome reprieve" for recreational users.

He said the 18 per cent level would form the basis for even more inflows in a few months time.

"Now that the catchment is wet and running, and generating inflows, we're in a better position for rain that is forecast to continue that trend," he said.

"The Bureau [of Metereology] is telling us there's some prospect of rain towards the end of winter and moving into spring."

It's the highest the dam has been in a while, with the level at just seven per cent in February of this year.

The Bureau of Meterology's station at the Gunnedah airport recorded a total of 18.8mm of rain over the weekend until Tuesday morning.

There was 33mm recorded in Werris Creek between Saturday and Tuesday morning, causing flooding.

Many roads closed in the Liverpool Plains shire on Tuesday due to water over the roads.