from August to February, with a minimum average monthly discharge of in September. Generally speaking, this makes the Isère a very plentiful watercourse throughout the year. However, the can drop to during a five-year dry spell, which is very low. On the other hand, severe flooding can result from rapid thaw or torrential autumn rain. In fact, and QIX 5 are and , respectively. QIX 10 is . QIX 20 reaches , while QIX 50 rises to , which is still moderate compared to other rivers in the south of France, like the Tarn. The highest instantaneous discharge on record was on September 16, 1960, while the highest daily value was on October 7 of the same year. The depth of runoff for the Isère's drainage basin is annually, which is quite high above France's average and clearly superior to that of the Rhône's drainage basin ( in Valence for a surface area of ). The specific discharge is 27.9 liters per second per square kilometer of drainage basin. Gallery See also List of rivers of France References External links Rivers of France Rivers of Drôme Rivers of Isère Rivers of Savoie Rivers of Auvergne-Rhône-Alpes Rivers of the Alps