The Hérault is a 160 km long coastal river of the south of France. It brings a lot of water to the region, but it is subject to important floods. It has an abundant flow : more than 1.3 billion tones of water per year are discharged. The irregularity of its flow is quite a problem, espacially concerning sudden floods, linked to the rainfall in the Mont Aigoual mountain range, that reached a flow of 1.500 m³/s on the 1st December 1958 and of 1.320 m³/s on the 19th December 1997, so to say the average flow of the Rhône river in Valence. However, in August, the flow can go down to 7.5 m³/s. The depth of runoff in the Hérault basin is of 543 millimeter/year, which is higher than the average in France. Thus, here is a coastal river absolutely typical of the Mediterranean banks.
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