What a croc: reptiles spotted around flooded town

Crocodiles have been spotted after homes and businesses were swamped by a weekend deluge, forcing about 700 people to seek shelter.

One of the reptiles was seen swimming on the inundated field of the Katherine South Football Club, who are fittingly known as "the Crocs".

"I don't think he was small," Katherine Mayor Joanna Holden told AAP.

Authorities have urged people not to enter floodwaters due to the threat of being swept away or encountering crocodiles that rove far afield along waterways.

Madi Hohn, Katherine South Football Club president, said friends had reported seeing freshwater crocs wandering around.

"There was a bunch walking down the road and a few in town," she told AAP.

"People are watching them from their houses which is quite funny."

Power remains cut to many properties in the town of about 10,000 after flooding forced the closure of Katherine's hospital, schools, government services and many shops.

Residents have been told to boil water as a precaution while water is also a concern in Darwin following flash flooding.

Residents of the NT capital have been urged to minimise use and boil water for drinking and cooking after the Darwin River Dam stopped operating late on Monday due to flooding of a pump station.

Hundreds of residents from the inundated NT communities of Daly River, Palumpa, Beswick and Jilkminggan were airlifted mostly to Darwin over the weekend.

Ms Holden said after five days of flood worries, her community was getting tired.

"It is just such a difficult and emotional time for people," she said.

Clean-up work has been put on hold but authorities were proceeding with assessments and repair work where they could.

The local Woolworths also reopened late on Monday after trucks made it through to restock the store.

Times are tough but the community has pulled together while keeping its sense of humour, it seems.

"I haven't seen Noah yet so that's a good sign," Ms Holden said.