Le Chassezac Au Malpas Cornillon

France River 1 - Excellent

Malpas-Cornillon is a bathing area located on the Chassezac river in the Ardèche region of France. The site is situated upstream of the Chassezac Gorges and downstream of Les Vans, in a tourist zone characterized by gorges, forests, campsites, and caves. The bathing area is vulnerable to pollution from various sources including precipitation, wastewater discharge, and high visitor numbers. Swimming is a popular activity along the Chassezac, particularly during the summer season when recreational activities and wastewater systems operate at full capacity.

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Water

Chassezac river. The river basin is characterized by varied geomorphology including limestone plateaus, ancient volcanic zones, alluvial plains, and granite mountains. The river experiences both severe low-water periods and heavy floods.

Location

Les Vans, Ardèche region, France. Located on the Chassezac river between Les Vans and the Chassezac Gorges.

Season

Peak swimming activity occurs during the summer period, coinciding with high visitor numbers and full operation of leisure activities and wastewater systems.

Water Quality

Type 1 profile established on 10 June 2014. Water quality is monitored through regular sampling. The bathing area is vulnerable to contamination from multiple sources including precipitation, wastewater treatment plant discharges, high visitor frequency, recreational activities (canoeing, kayaking, camping, fishing), and human activity in the watershed.

Risks

Potential pollution sources identified include wastewater discharges, precipitation events, high visitor numbers during peak season, recreational water activities, camping facilities, and activities in the surrounding watershed. The territory experiences a contrasting climate (Cevennes climate) with severe low-water periods and heavy flooding that may be catastrophic. Vulnerability to cyanobacteria, macro-algae, and phytoplankton proliferation is assessed.