The Buëch () is a river in southeastern France, a right tributary of the Durance. It is also called the Grand Buëch in its upper course just to the confluence with the Petit Buëch river.
Geography
The Buëch river has a length of and a drainage basin with an area of approximately .
Its average yearly discharge (volume of water which passes through a section of the river per unit of time) is at Laragne-Montéglin in the Hautes-Alpes department, for a period of 15 years.
Average monthly discharge (m3/s) at Laragne-Montéglin
Course
The Buëch starts several kilometres to the east of col de la Croix-Haute, a mountain pass in the western side of the Massif du Dévoluy mountains, in the commune of Lus-la-Croix-Haute, Drôme department, at an elevation of about . It then flows to the southwest and gets into the Hautes-Alpes department and then flows to the south.
Finally, the river flows into the Durance river, as a right tributary, near Sisteron, in the Alpes-de-Haute-Provence department.
The Buëch flows through 3 departments and 23 communes, in 2 regions: Auvergne-Rhône-Alpes región Drôme: Lus-la-Croix-Haute Provence-Alpes-Côte d'Azur region Hautes-Alpes: La Faurie, Aspres-sur-Buëch, Serres, Saint-Julien-en-Beauchêne, Laragne-Montéglin Alpes-de-Haute-Provence: Mison, Sisteron
Main tributaries
The main tributaries of the Buëch river are:
Left tributaries: Petit Buëch - 44.5 km
Right tributaries: Blaisance - 19.1 km Céans - 22.4 km Méouge - 39.6 km