Flash flooding creates traffic chaos

Parts of Victoria are on flood watch, after heavy rain drenched much of the state.

The weather bureau says 63 millimetres of rain has fallen at Jeeralang in Gippsland and 58 millimetres at Doncaster in Melbourne's east.

There is a severe weather warning for flash flooding in the north central, central, west and South Gippsland, and north-east districts.

Forecaster Christie Johnson says the bureau is keeping a flood watch in a number of catchments.

"I think the risk mostly now is in the Dandenongs and the northern part of West and South Gippsland as the low moves up in that area," she said.

Police says a number of roads have flooded, including CityLink at Hawthorn, and the Monash Freeway at Kooyong and Glen Iris.

Metro has suspended trains on the Sandringham. Services have just resumed on the Alamein line. Buses are running between Elsternwick and South Yarra because there is water over the tracks at Windsor station.

Buses are also taking passengers between Alamein and Camberwell to avoid flooding in Ashburton.

There are also delays on the Hurstbridge, Werribee and Williamstown lines.

The State Emergency Service (SES) has been called in to help motorists stranded in floodwaters at Blackburn in the eastern suburbs last night.

SES Spokeswoman Emma Buick says people should not try to drive through flooding.

"Please do not drive or walk into floodwaters, it is extremely dangerous," she said.

"You do have the potential to get sucked under by a drain, you just can't see what's under the water there."

The SES has had 130 calls for help as a result of the wet weather. Most of them were centred around Nunawading.

Spokesman Lachlan Quick says the calls mainly related to flash flooding and building damage.

The heavy rain has forced Melbourne Water to release diluted sewage into the Merri, Moonee Ponds and Gardiners Creeks.

Spokesman Andrew McGinnes says it is designed to stop sewage coming back up in people's homes.

"When we get really intense rainfall, then the system can fill up with stormwater and then as a result, we need to release some of that into rivers to stop it backing up into people's houses," he said.

"Normally it would come up through your shower, which is generally the lowest point in your house."