A rainfall flood watch has been issued for the southwest Assiniboine River, provincial officials warned.

Water levels on the Assiniboine and Souris rivers are rising due to heavy rainfall, according to officials with the province’s Hydrologic Forecast and Water Management Centre.

The two rivers got between 280 to 300 per cent more precipitation than normal from Aug. 19 to Sept 1.

That translated to about 120 millimetres of rain.

Now, flows are up on the Assiniboine River. Peak flows are expected to hit between 12,000 and 12,500 cubic feet per second in Portage la Prairie on Wednesday or Thursday.

Provincial officials said it may be necessary to use the Portage Diversion if heavy rains continue, but they’d like to avoid that as the diversion needs critical repairs.

Officials are also worried about overland flooding downstream.

About 50 mm of rain is forecast to fall on Thursday, which could raise flows on the Assiniboine to 14,000 to 15,000 cfs.