fluctuating between per second, with a low of in August, and a small "peak" cut in November, linked to the autumnal rain. However, these fluctuations are much more pronounced over short periods and depend on the year. During times of low water, the low water discharge can fall as low as per second, in the case of a dry quinquennial period, and although low, it is considered normal in the regions of the Alps and Prealps. In terms of floods which, although uncommon, can be very important, measures with certain "eau du midi". The maximum instantaneous discharge for a two-year (P2) and five-year (P5) flood events are respectively. The ten-year flood event (P10) is per second, the twenty-year flood event (P20) , and the fifty-year flood (P50) . The highest instantaneous flow recorded by the Reyvroz station was per second on the June 1, 1963, while the maximum daily value was per second on September 22, 1968. For comparison, the June 1963 value is comparable to a vicennial flood event, and is thus considered not that exceptional. The discharge volume of Dranse is augmented by the abundant precipitation in the northern Alps. The runoff curve number for its drainage basin is annually, which elevated, is three times greater than the average for all of France. The specific discharge (Qsp) of the river reaches per second and square kilometer of the basin. See also List of rivers of France References External links Le Delta de la Dranse, on the Natura 2000 website Banque Hydro - Station V0334010 - La Dranse à Reyvroz (Bioge) (Synthèse) (the "Station en service" is unchecked) Rivers of France Rivers of Haute-Savoie Rivers of Auvergne-Rhône-Alpes