While the dry conditions remain, Bogan Shire mayor Ray Donald said the additional flows were positive news for the shire, as it would allow the Macquarie River to supply Nyngan beyond Water NSW's forecast of April this year.

"The good thing is that there's some spare water come in, finally into the systems," Cr Donald said.

"We understand that the very advanced forecast of how long the water from Burrendong will last, has now been pushed back further ... to about December this year, which is a good thing."

The recent rainfall in the Dubbo and Wellington areas has provided an increased inflow into the Macquarie River, allowing Water NSW, the state water authority, to supply high security water for areas downstream of Burrendong.

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The Bogan Shire Council had been requested to take the additional water and temporarily store it in the lower recreation weir and then pump it back up into the top water supply weir as required.

It's believed water had also been sent to Gunningbar and Duck Creek.

"The direct message is that it is high security water, it's our next channel run or high security water allocation, so we've been asked to store it there and it will then be pumped back into the upper weir pool to be used for the needs of Nyngan and Cobar," Cr Donald said.

The council announced this water was for the purpose of Nyngan and Cobar town water supplies and cannot be used for irrigation.

Cr Donald said the extra inflows would also alleviate the need to use the alternate ground water supplies currently being scoped by drilling contractors for "critical human needs".

The mayor was also pleased to announce that work had begun to repair the town's emergency water supply, south of Nyngan, after it was revealed there was a leak in the floor of the dam.

"Local contractor Neill Earthmoving won the contract to repair it, and in layman's terms it basically means putting in a new bottom in it that will be waterproof," Cr Donald said.

Water that was remaining in the emergency storage system was pumped up to Cobar's storage.

Cr Donald said that while the initiative of the dam was to provide an emergency storage supply for both Nyngan and Cobar, he hopes a "compilable amount" be returned for Nyngan's use.

"A record's been kept of that so that if it is able to be refilled, then it needs to be remembered that the water that was in there was sent up to the Cobar's storage, so we feel that a compilable amount should be put in there that's for our use," he said.

"But I hope then from a bit of extra water that's around, we can refill it."