![]() ![]() ![]() This current causes the water level to rise gradually for about 30 minutes. Each release generates a current that gradually increases to reach a limited and maximum flow of 100 m3/s within 20 minutes, immediately downstream of the dam. Regulated flushes are triggered six hours after high water. Water is released progressively to allow the Couesnon to push sediment as far as possible into the bay. Seawater is stored in the Couesnon Canal and in a water reserve located 5 km upstream, known as Moidrey Cove. As a result, it regulates the waters of the Couesnon and the sea twice a day, to the rhythm of the tides. What’s more, it opens to let seawater reach the river, producing a release of water on the ebb tide. The dam was designed to restore Mont Saint-Michel to an island. Tide schedules The release of water from the dam on the Couesnon River Wind and atmospheric pressure can affect the timing and height of the tide. Please note: the tide can be influenced by weather phenomena. But you must be a trained sportsman, as the force of the current is surprising and can force you to lose your balance. It is not uncommon to see kayakers enjoying the pleasure of surfing on the rip current. In the bay of Mont Saint Michel, the tidal bore reaches the courses of the Sée, the Sélune and the Couesnon rivers. It takes on even greater proportions when it enters the mouth of a river. The “tidal bore”, a wave that can reach several tens of centimetres in fast flowing water, is formed during the rising tide. List of the guides in the bay Grandes marées The tidal bore ![]()
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