NSW State Emergency Service is working to resupply a number of communities isolated by flooding in Collarenebri, Walgett, Lightning Ridge, Goodooga, Brewarrina and parts of Bourke.
NSW SES Assistant Commissioner Nicole Hogan said this was a very complex and evolving situation.
"The size of the area is about 40,000 square kilometres - more than half the size of Tasmania," she said.
"Roads have intermittently been cut for several weeks now, with resupply missions needing to take place by airplane to regional depots, before being loaded onto helicopters and finally transported by vehicles and boats to the desired recipients.
"With renewed flooding expected, we anticipate this remote outreach will need to continue for some time. We are conducting regular flights to ensure the 5000 or so isolated residents receive the essential foods, medicines, mail and essentials they need.
