Areas of British Columbia braced for heavy rain late Sunday as weather forecasters warned the precipitation could bring flooding in communities already reeling from overflowing waterways.

Teresa Fisico of the CBC Weather Centre said the coastal area could be hit with up to 80 millimetres of rain overnight — a level considered normal for a two-week period — along with heavy snow in the Interior.

"There's currently rainfall warnings out for the coast, which means another band of fairly heavy precipitation, and we've already seen lots of rain through this area for the month of November," she said.

The warning comes as bad news to homeowners in B.C.'s Fraser Valley along the Chilliwack River, which burst its banks only a week ago. The river rose ominously Sunday and swept uprooted trees downstream.

"It's totally changed," Penny Kuiack told the CBC Sunday. "It's a brand new river now."

As of Sunday, work crews were still trying to complete a new dike to hold the river back, while resident Patricia McKay looked on. 

"I worry, but yet the trucks are here now and so I think I will be able to sleep a little better," McKay said.

"I'm worried about tonight," her daughter-in-law Linda McKay said as she watched the river's rushing water. "It's her first night back after the flood and I'm worried that she's going to be here."

The evacuation of about 200 homes was ordered only a week ago after heavy rains boosted the river to dangerous levels.