Due to the high summer heat, Lake Annecy loses an average of 1 centimeter of water per day. Its level remains under close surveillance due to concerns about the flow of rivers downstream.
Water up to the calves for several tens of meters. Lake Annecy, particularly low this summer, has lost an average of 1 centimeter per day since the start of the season. A situation that is almost reminiscent of the dramatic drop in 2018, when the waters of the lake were 46 cm below the regulatory dimension.
On the Pâquier, many walkers are tempted by the clear waters of the lake. And to see the drop in the water level. “Usually, we have water about twenty centimeters higher”remarks an Annecy. “We have a boat in port and it’s just to get it out now”adds a bather.
The level of Lake Annecy, which feeds several rivers downstream, is monitored daily. At 5:30 a.m., every morning, 365 days a year. This summer, the report is without appeal. He has lost 33 cm since July 1, 38 cm since the beginning of June. “Today (Thursday August 11, editor’s note)He’s 48 and yesterday he was 49. He’s losing about 1 centimeter of water a day right now, that’s average.”explains Murièle Cassorla, deputy director of urban cleanliness at the town hall of Annecy.
video length: 01min 56
Lake Annecy has been losing 1 centimeter of water a day since the start of summer
©France 3 Alps
A significant drop, without consequence for the moment for the fauna and flora. But it is the waterways fed by the lake that are of concern. “When the lake level drops, the flow will also drop. So if we want to have a constant flow, we have to make adjustments regularly (…) We have to leave a flow for aquatic life in the canals. And we have need to put water in the Fier”, adds Murielle Cassorla. The lake feeds 150 000 inhabitants with drinking water. For the time being, the resource does not seem to be threatened, unlike the rest of the department, five sectors of which are placed in “crisis” drought, the highest level of alert.
“We look at the situation of the lake but we must also look at the situation of the entire basin in which it is located. It is an important call for a sense of civic responsibility and responsibility in all the uses that we can have of the water and in compliance with the regulations, with all the restrictions on use that we have been able to take because we have been in crisis for a few days”, believes Thomas Fauconnier, secretary general of the prefecture of Haute-Savoie. Only new precipitation could raise the level of the lake. Rain is also forecast for the next few days.