Water drought coordinator for the Department of Planning, Industry and Environment, Michael Wrathall, revealed the possible transfer on the eve of a public drought information session in Dubbo on Wednesday afternoon.

"If we don't get any further inflows (into Burrendong Dam) we've basically got surface water until at least the middle of next year," he told the Daily Liberal.

"We're certainly looking at a range of measures to extend that even further.

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"Particularly in the Macquarie, most of the inflows tend to arrive in the winter/spring period.

"If we can extend supplies until at least September or October next year it's highly likely we'll get something into the dam."

Mr Wrathall confirmed a transfer of water under "normal water sharing rules" from Windamere Dam to Burrendong Dam this year and the pumping of its remnant storage to provide Dubbo with surface water until mid-2020.

"I guess if it gets particularly severe..then we would have to look at whether we need to transfer a little bit more from Windamere Dam for critical needs downstream," he said.

Dubbo will host the 27^th public drought information session in a series which began in February.

Landholders and water users are expected to make up most of the crowd at Club Dubbo from 4.30pm to 6.30pm on Wednesday.

They will hear about climate trends, forecasts, water availability, proposed management measures if dry conditions persist and much more.

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Mr Wrathall reports that "from a water perspective" the Macquarie Valley is suffering the most from the drought in NSW.

He said it had dragged on for almost three years and inflows into Burrendong Dam were "about a third of the previous lowest inflows in the 80s".

"We've really seen both the increase in the length of the drought but also the intensity too with high temperatures over the last couple of years and very-low rainfall over the last two-and-a-half years," Mr Wrathall said.

He says rain is not on the horizon.

"Towards late summer the forecast is turning slightly more towards average but even average rainfall is not going to get us out of the current situation," Mr Wrathall said.

"We probably need three months of high rainfall to get us out of this."

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Should Burrendong Dam miss out on another so-called fill season, Mr Wrathall points to groundwater which would be Dubbo's "main supply".

Dubbo has an annual groundwater entitlement of about 4.3 gigalitres (GL) but needs 6.5GL under level four water restrictions.

"Where there is a need to secure town water supplies there's the ability for us to provide additional water," Mr Wrathall said.