Rance (river)

Rance
The Rance in Dinan.
Native name	La Rance
Basin
Main source	Brittany
River mouth	English Channel 48°38′28″N 2°2′26″W / 48.64111°N 2.04056°WCoordinates: 48°38′28″N 2°2′26″W / 48.64111°N 2.04056°W
Watershed area	1,195 km²
Countries	France
Physiognomy
Length	102 km
Avg. discharge	12 m³/s

The Rance is a river of northwestern France.^[1] It flows into the English Channel between Dinard and Saint-Malo.

Before reaching the Channel, its waters are barred by a 750 metre long dam forming the Rance tidal power plant.

The river is linked to the Vilaine by means of the Canal d'Ille-et-Rance.

Départements and towns along the river:

• Côtes-d'Armor : Collinée, Caulnes, Dinan
• Ille-et-Vilaine : Dinard, Saint-Malo

Hydrology and water quality

Tributaries of the Rance include:

• Croqueloir
• Clergé
• Fremeur
• Quinéford

This river has moderate turbidity and its brownish water is somewhat low in velocity due to the slight gradient of the watercourse; pH levels have been measured at 8.13^[2] within the city of Dinan and electrical conductivity of the waters have tested at 33 micro-siemens per centimetre. At this reference location, summer flows are typically in the range of 500 cubic feet per second (14 m³/s).

References

1. Atlas des Routes de France, Solar Press: Donnees IGN (2007)
2. Hogan, C. Michael, Water quality of freshwater bodies in France, Lumina Press, Aberdeen, Scotland(2006)