Sydney , Australia ( CNN ) -- More than 4,000 people were isolated by flood waters and as many as 1,800 have been evacuated in the Australian state of New South Wales after a week of heavy rains , the government said Monday . As a result of this week 's rains , the government has so far issued disaster declarations in 17 of the state 's rural and suburban districts , predominantly in the south and west . They join 17 other districts declared disaster areas after flooding in October . The flooding , which is expected to continue as a new storm front is forecast to bring extended heavy rains through Friday , has already destroyed an estimated $ 500 million in crops in the region , according to a statement issued by New South Wales Emergency Services . The hardest-hit communities include Wagga Wagga and Coonamble , both located in the southern part of North South Wales , which is located in Australia 's southeast . The community of North Wagga Wagga was completely isolated on Monday , the emergency services agency said . Some evacuated residents of Eastern Coonamble have been allowed to return to their homes , although the government warned further flooding expected from the rains forecast for later this week could renew the danger . Flood warnings remained in effect Monday for communities along 13 rivers in New South Wales , including Castlereagh River , MacQuarie River and Murrumbidgee River . The Australian Bureau of Meteorology issued a flood watch Monday for northwest , southwest and central New South Wales , warning that another significant storm approaching the region could cause additional flooding . Since the most recent flooding began Nov. 29 , emergency workers have executed 67 flood rescues and received more than 1,300 requests for assistance , the emergency services agency said . Most of the requests involved damage caused by flash flooding .
Heavy rains this week have resulted in major flooding in parts of New South Wales . More than 4,000 people remained affected by flood waters . Additional rainfall is expected to renew the threat mid - week .