Flood warnings issued for South Australia’s Angas and Bremer rivers after storms

(9News AU)A general flood warning has been issued for South Australia’s Angas and Bremer Rivers, after much of the state was soaked during storms overnight.

“Following rainfall overnight and this morning the Angas and Bremer Rivers are likely to rise to flood levels,” the Bureau of Meteorology (BoM) warning advised.

Flooding may occur along the Angas River particularly downstream of Willyaroo and along the Bremer River particularly at Wanstead Road and Langhorne Creek tonight, the BoM warned.

Earlier, the SES and police urged residents to brace for possible flooding and be aware of updated warnings, with the Bremer, Torrens and Onkaparinga rivers among the most swollen waterways.

Overnight, the Onkaparinga River swelled and the Bureau of Meteorology issued a flood watch and act, with the towns of Hahndorf, Lobethal, Oakside, Woodside and Verdun believed to be most prone to flash flooding.

Authorities urged residents to prepare their homes for flooding and move to a safer location if it is safe to do so.

“Be aware that floodwaters may rise rapidly and are likely to be fast moving. You should never walk, ride or drive through floodwater or allow children to play in or near floodwater,” police said in a statement.

Flood warnings and watches have been issued for parts of SA. (9NEWS)

The wild weather should clear South Australia later today and authorities will then have a better idea of its impact on waterways, SES Deputy Chief Officer Dermot Barry said.

“We have currently a severe weather warning across most of the state, and our crews have been very busy in the last three to four hours responding mainly to severe weather impacts of some trees down and some localised flooding as well,” he said.

“The front that’s impacting the state at the moment should be clear later today, so really for us it’s the next six to eight hours where we’ll get a good understanding of the impacts of that front, we’ll see how much rain fell and then really start to monitor our bigger rivers and streams just to get a better idea of what we can anticipate over the next 24 hours from a flooding perspective.”

About 4am today, a freight train driver was injured by a falling tree while trying to clear another tree that had fallen on to his train at Verdun, in the Adelaide Hills.

Firefighters and paramedics rescued a train driver crushed by a tree in the Adelaide Hills. (9NEWS)

“Upon inspecting the tree, unfortunately he’s had a second tree come down after hearing a crack, striking him and pinning him to the ground,” SA Ambulance spokesman Clinton Daniels said.

Firefighters and paramedics freed the man, and he was treated for chest and leg injuries. Another train driver has been called in to move the train.

The sodden Adelaide Hills had been braced for another drenching after last week’s severe weather.

Both Prime Minister Malcolm Turnbull and Opposition Leader Bill Shorten visited weather-affected areas of South Australia yesterday.

For a full list of South Australia weather warnings, visit the Bureau of Meteorology website.