Recently, parts of France have been affected by severe flooding, and 1,600 people have been evacuated as a result.
A top regional official, Thierry Dousset, told French news channel BFM TV that the some 750 people evacuated came from five campsites.
A deluge of heavy rain left summer campsites in Gard, Ardeche and Drome completely submerged by flood water, leaving hundreds of tourists scrambling to safety.
The man, who is believed to be in his 70s, was helping supervise over 119 German children and youths who were camping in Saint-Julien-de-Peyrolas.
"The level and speed of the river today was extraordinary - we woke up in about a foot of water", Rachel Buchanan said.
Police said the caravan was later found "empty and in pieces" after being swept away by water that overflowed from the Ardeche River.
He added: 'Helicopters are being used in the relief operations, with valleys particularly badly hit'.
Four German citizens were also taken to hospital for hypothermia.
'No one has suitcases.
More than 400 firefighters and gendarmes, many sent in from other regions, helped in the evacuations, using helicopters to spot camp sites and to perform rescues.
Residents in the area were urged to monitor the weather and give flood waters time to recede.
The French weather service has issued orange and yellow alerts for parts of southeast France that will remain in place until 4pm.
Tents have been destroyed and roads overwhelmed with water after nearly three inches of rain fell in under 24 hours, causing rivers to overflow at a rapid rate.
Electricity supplies have been cut in some villages, while roads have been gridlocked because of the number of people trying to get to high ground.