A woman's been flown to Melbourne's Alfred Hospital with head injuries after an accident at Drysdale.

Emergency crews were called to the collision on the Portarlington Geelong Road just before 7-30 last night.

It's understood the woman, who is aged in her 60s, was trapped by the legs for nearly three quarters of an hour before being released.

It’s believed the woman lost control of her car after hitting water on the road.

Police are blaming a spate of accidents on the rain, with over 20-millimetres falling on Geelong in the last 24 hours.

Cape Otway's officially recorded 23 mills, while Avalon and Werribee have both recorded more than 21 mills.

Our newsroom’s had reports of particularly bad spots at the corner of Carrs and Ballan roads in Anakie, Upper Anakie Road,  and Melbourne Road North Geelong.

This view from the K-Rock newsroom shows stormy weather on the horizon for Geelong