Confluence of the Drac with the Isère in Grenoble
|• location||Massif des Écrins|
|Length||130 km (81 mi)|
|Basin size||3,599 km2 (1,390 sq mi)|
|• average||97 m3/s (3,400 cu ft/s)|
|Progression||Isère→ Rhône→ Mediterranean Sea|
The Drac is a 130-kilometre (81 mi) long river in southeastern France. It is a left tributary of the river Isère. It is formed at the confluence of the Drac Noir and the Drac Blanc, which both rise in the southern part of the Massif des Écrins, high in the French Alps. It flows through several reservoirs on its course, including the Lac de Monteynard-Avignonet. It flows into the Isère at Grenoble. Its major tributary is the Romanche.
The Drac flows through the following departments and towns:
The average flow of the Drac at Fontaine is 97 cubic metres per second (3,400 cu ft/s), with the highest monthly flows occurring in June, due to the melting of Alpine glaciers. The catchment area of the river is 3,599 square kilometres (1,390 sq mi), which has an average rainfall of 859 millimetres (33.8 in).
The name Drac, originally the Drau, is due to an attraction by the Occitan drac "imp", which is derived from the Latin dracō, meaning "Dragon". It is documented in the forms of Dracum (v. 1100), Dravus (1289) and the ribière dou Drau (1545). The word "Drac" means Dragon. In many legends the drac, in Occitan, is a genius of evil waters or a form of Satan that attracts children to drown.Frédéric Mistral wrote in Félibrige Treasury:
Drac of the Rhone was a winged monster and amphibian which carried on the body of a reptile the shoulders and the head of a beautiful young man. He lived the bottom of the river where he tried to attract, to devour it, the imprudent ones gained by the softness of its voice.
In December 1995, six children and their teacher were drowned in the river after the level of water rose due to the opening of the valves of a dam. They were there to see beavers. All of them died.
The Var is a river located in the southeast of France. It is 114 km (71 mi) long. Its drainage basin is 2,812 km2 (1,086 sq mi).
The Saône is a river of eastern France. It is a right tributary of the Rhône, rising at Vioménil in the Vosges department and joining the Rhône in Lyon, just south of the Presqu'île.
The Vercors Massif is a range in France consisting of rugged plateaux and mountains straddling the départements of Isère and Drôme in the French Prealps. It lies west of the Dauphiné Alps, from which it is separated by the rivers Drac and Isère. The cliffs at the massif's eastern limit face the city of Grenoble.
The Isère is a river in the Auvergne-Rhône-Alpes region of southeastern France. Its source, a glacier known as the Sources de l'Isère, lies in the Vanoise National Park in the Graian Alps of Savoie, near the ski resort Val d'Isère on the border with Italy. An important left-bank tributary of the Rhône, the Isère merges with it a few kilometers north of Valence.
The Tarn is a 380.2-kilometre (236.2 mi) long river in the administrative region of Occitanie in southern France. It is a right tributary of the Garonne.
The Romanche is a 78.3-kilometre (48.7 mi) long mountain river in southeastern France. It is a right tributary of the Drac, which is itself a tributary of the Isère. Its drainage basin is 1,221 km2 (471 sq mi). Its source is in the northern part of the Massif des Écrins, Dauphiné Alps. It flows into the Drac in Champ-sur-Drac, south of Grenoble. The road from Grenoble to Briançon over the Col du Lautaret runs through the Romanche valley. There are several mountain and ski resorts in the valley, including Alpe d'Huez, La Grave and Les Deux Alpes.
The Creuse is a 263-kilometre (163 mi) long river in western France, a tributary of the Vienne. Its source is in the Plateau de Millevaches, a north-western extension of the Massif Central.
The arrondissement of Grenoble is an arrondissement of France in the Isère department in the Auvergne-Rhône-Alpes region. It has 263 communes. Its population is 738,149 (2016), and its area is 4,398.7 km2 (1,698.3 sq mi).
The Cailly is a river in Normandy, France, 29 kilometres (18 mi) in length, flowing through the department of Seine-Maritime. It is a right tributary of the Seine.
Grenoble-Alpes Métropole is the métropole, an intercommunal structure, centred on the city of Grenoble. It is located in the Isère department, in the Auvergne-Rhône-Alpes region, eastern France. It was created in January 2015, replacing the previous Communauté d'agglomération de Grenoble. Its population was 451,752 in 2014, of which 163,625 in Grenoble proper.
Beaufin is a commune in the Isère department in the Auvergne-Rhône-Alpes region of south-eastern France.
L'Albenc is a commune in the Isère department in the Auvergne-Rhône-Alpes region of southeastern France.
The Bourbre is a 72.3 km (44.9 mi) long river in the Isère and Rhône departments in central eastern France. Its source is in Burcin. It flows generally north-northwest. It is a left tributary of the Rhône, into which it flows at Chavanoz.
The Asse is a 76.3-kilometre (47.4 mi) long river in the Alpes-de-Haute-Provence département, southeastern France. Its source is several small streams which converge at Tartonne, 12 kilometres (7 mi) east of Digne-les-Bains. It flows generally southwest. It is a left tributary of the Durance into which it flows between Valensole and Oraison, 9 kilometres (6 mi) northeast of Manosque. Its drainage basin is 657 km2 (254 sq mi).
The Aubetin is a 61.2-kilometre (38.0 mi) long river in the Marne and Seine-et-Marne départements, northeastern France. Its source is at Les Essarts-le-Vicomte, 20 kilometres (12 mi) northeast of Nogent-sur-Seine. It flows generally west-northwest. It is a left tributary of the Grand Morin into which it flows at Pommeuse, 5 kilometres (3 mi) west of Coulommiers.
The French sculptor Victor Sappey was born in Grenoble in Isère on 11 February 1801 and died on 23 March 1856. He was also known as Pierre-Victor Sappey. His father was a stonemason.
The Méouge, is a 39-kilometre (24 mi) river in the Auvergne-Rhône-Alpes and Provence-Alpes-Côte d'Azur regions of the south of France. It rises in the Drôme near the town of Séderon and crosses into the Hautes-Alpes at Barret-sur-Méouge where it carves the spectacular tourist attraction, the Gorges de la Méouge, through the limestone platform. Near the communities of Châteauneuf-de-Chabre and Antonaves it joins the river Buëch which in turn flows into the Durance and the Rhône. Its drainage basin is 229 km2 (88 sq mi).
The Moselotte is a river in Lorraine, in the French department of Vosges. It is a direct right tributary of the Moselle, and thus a sub-tributary of the Rhine.
Historically, centenarian floods did extensive damage in the Isere valley. In October 1859, it rained continuously for five days. A warm wind melted the snow, and the temperature suddenly increased from 12 to 19 degrees on 2 November. The simultaneity of those two events resulted in an exceptional flood. In a single night, the water in Grenoble rose at a rate of 15 to 20 cm per hour.
The Isère-Drac-Romanche Departmental Association is a public administrative establishment in France formed by the Conseil d'État in 1936. Its purpose is to maintain the system of flood-risk protection in the plains of the Isère, Drac, and Romanche rivers by preserving the integrity of embankments and their associated works. The organization performs all research and labor necessary for their preservation and keeps the system under constant surveillance in order to guarantee its efficiency in protecting the land and property at stake behind the embankments.
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