Violent and sudden rises in water levels which cause damage and take lives.
Three bodies were discovered in Gard on Sunday by emergency services.
The bad weather hitting the southern half of the country also caused the disappearance of four people in this department and in Ardèche.
Intense research by helicopter and drones was launched in support of personnel specialized in the aquatic environment.
A family of four, including two children, was caught in the waves while trying to cross by car on Saturday evening a submersible bridge, a structure that lowers underwater on the Gardon in Dions, a village of 500 inhabitants in the north Nimes.
The mother was found and taken to hospital, but the father and his children were still being sought as of Sunday evening.
In the neighboring department of Ardèche, the 70-year-old manager of a hydroelectric power station who left to check his installation has not given any news since Saturday evening.
Most of the missing were swept away while trying to cross rivers swollen by violent weather.
Gard and six other departments were placed on orange alert on Saturday by Météo France due to the episode of very heavy precipitation linked to storm Monica which swept a large quarter of the south-east of France.
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