Rural Manitoba roads have been washed out in places because of flooding after heavy rains drenched the southwest corner of the province Friday.

Flood warnings remained in place for many communities, authorities said Saturday.

"We've had some municipalities — again these are just preliminary estimates — with 30 or 40 roads that have been topped over," Paul Guyader, a spokesperson for Manitoba's Emergency Measures agency, said. "Over the weekend, there will be more assessments to give us an amount of roads."

Officials said the worst hit area for flooding was the Duck Mountain area, and it will take days before the waters subside.

"It takes quite a while to drain off," Alf Warkentin, a flood forecaster for the Manitoba government, told CBC News. "You have a lot of water sitting around and the drainage simply can't handle this volume of water. The drainage is designed for a one-in-10-year event. This is probably more like a one-in-50-year event."