Etang De La Mutche (Morhange Plage)

France Lake 4 - Poor

The Étang de la Mutche is an artificial pond located in the territories of Morhange and Harprich in Moselle, France. Originally created in the Middle Ages for fish farming, it now serves dual purposes as a tourism destination with camping and bathing facilities, and as a protected natural area classified as a ZNIEFF for its bird fauna. The pond covers approximately 75 hectares at an altitude of 250 meters with a maximum depth of 2.5 meters. It is fed by the Betz stream from the south and drained by the same stream to the north, with a water renewal time of approximately 6 weeks.

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Water

Artificial pond with a surface area of approximately 75 hectares. Altitude of water level approximately 250 meters. Maximum depth approximately 2.5 meters. Water level variations of approximately 30 centimeters during a hydrological cycle. Average feed discharge estimated at 275 liters per second. Water renewal time approximately 6 weeks. The pond is located in a watershed covering approximately 11 square kilometers.

Location

The pond is situated on the territories of Morhange and Harprich communes in Moselle department. The bathing zone is located on the western side of the pond within a leisure zone on a peninsula of land. Access to the leisure zone is not permitted for motorized vehicles except service vehicles.

Water Quality

Microbiological analysis data are presented in the report. Cyanobacteria research results are documented. Water quality is affected by agricultural runoff, industrial inputs from the Lavoisier industrial zone, and bird presence. The pond's bottom is primarily impermeable due to its marly encasing, with limited groundwater interactions.

Risks

Identified risks include proliferation of cyanobacteria, macro-algae, and phytoplankton. Short-term pollution risks are linked to bird presence and contamination from the Betz stream runoff. Runoff water risks and meteorological condition impacts are documented as potential pollution sources. The Betz stream originates less than 3 kilometers downstream from Baronville agglomeration and receives water from the Lavoisier industrial zone.