The tide is a regular rise and fall in sea level levels. the level is influenced by how the earth rotates in relation to the lunar and solar gravitational fields.
When the moon and sun are on either side of the earth, they predict a spring flood that results in a powerful tidal flood . Spring flood also happens at new moon and full moon.
It is a good idea to always keep track of when the tide is highest and lowest when planning a visit to the Wadden Sea.
The tide in the Romo-Tønder area varies between +1 meters and -1 meters, ie. that when the water is at its peak, a grown man would not be able to reach the bottom if the person stood somewhere where there was no water during the low tide period.
When there is a flood, the water level can rise even higher. In 1999, on December 3, there was a 100 year record of 5 meters inside Ribe and this was even in the low tide.