People have been left stranded and trapped in their vehicles as flash floods hit Cornwall. Torrential downpours on Saturday night and Sunday morning turned roads into rivers across the Duchy. Firefighters are tweeting warnings to drivers, after a string of rescues across the county. Wadebridge Fire Station tweeted the above photo, commenting: "One foot of water is enough to float most vehicles. This driver thought he could drive through 4 feet of water. Don't risk your life".Polperro is among the worst-hit villages, with locals posting photos and videos standing ankle-deep in water. This was the scene on Sunday morning, as torrents washed through the streets. The Environment Agency has issued a flood alert for rivers in the area, posting: "Heavy rain has fallen overnight and this morning and river levels are reacting quickly. "The main areas of concern are currently the Rivers Camel, Allen and Bodmin Town Leat catchments. "The heaviest rainfall is expected to ease this afternoon and river levels are expected to fall throughout the afternoon and evening. "We will provide updates when required. We are monitoring the situation, and have operatives in the field, where required, to clear blockages". Waderbridge Community Fire Station received multiple calls to rescue drivers after they attempted to make it through the rising water. The first call came on Sunday afternoon when a van became stranded in 4ft of water, followed by a second call to a car in water hear Hengar Manor. Posting on Facebook, they said: "One casualty rescued successfully from a van in 4ft of water. "We're now proceeding to a car in flood water near Hengar Manor. Please do not drive through flood water!"