The strait Evripos has width 39 meters, length 40 meters and a depth of 8.5 meters. In this presents the following “strange” phenomenon: the water is constantly moving while changing direction of movement. Sometimes directed towards the North and sometimes in the South Evian. After systematic observations found that 22 to 23 days of every month of the current presents a regularity and changed once every 6 hours, thus supplementing four rotations every 24 hours and 50 minutes just as the tide. From the days of normal power 11 to 12 correspond to the period of the New Moon, and as many in the period of the full moon. Many times an arrhythmia occurs, whereby the effect is completed in 22 hours and 22 minutes. The remaining 6 or 7 days, of which three days corresponding to the period of the first and the rest of the period of the last quarter, the current is irregular. The current speed is 5-6 mph, and sometimes it can be raised to 9 miles per hour. And when the current is amplified by the strong northern winds, which blow occasionally in the speed range of the upper water masses in the South Evian is widening. It is said, rather too, that in this case would struggle and a shark swimming in the opposite direction.
The tidal wave is born from the attraction of the moon in the eastern Mediterranean and is directed to the west.
The time of the split-tsunami Aegean as it enters the South and North Evian Gulf. The wave that enters the South Evian Gulf reaches the narrow Evripos 1 hours and 15 minutes ahead of the wave arriving from the north because the path that is less. Thus, most of bodies arrive from the south earlier, thus raise the level within that portion by 30 to 40 cm, so-generated current from the south to the north. After six hours, the conditions are reversed because meanwhile reaches the narrow wave that entered the North Evian Gulf, so the level rises in the northern part of the strait leading to the current is reversed.
When it reaches the southern Aegean goes to the north and reaches the eastern coast of Evia approximately three hours after the moment in which the moon passes the meridian of Halkida. However the wave that enters the South Evian Gulf reaches the narrow Evripos 1 hours and 15 minutes ahead of the wave arriving from the north because the path that is less. But the volume of seawater southern wave is greater than the volume of the northern wave, because the north blocked the path of the narrow northern entrance of the North Evian Gulf in the region of Oreos. Thus, most of bodies arrive from the south earlier, thus raise the level in part there-only 30 to 40 cm when the current generated from the south to the voreia.Meta 6 hours reversed conditions because meanwhile reaches the narrow wave that entered the North Evian Gulf, so the level rises in the northern part of the strait leading to the current is reversed.
At the Full Moon and New Moon, when the tides are more intense, we have greater difference in level between North and South Evian Gulf and therefore stronger current. The period of 22 hours and 22 minutes should be attributed to the formation of the coasts on both sides of the Evian Gulf. At the time of the first and last quarter moon tides are not strong and therefore the waves entering the two bays is attenuated. All this plus the morphology of the coast, the seabed and the direction of winds contribute to the flow of water to be completely irregular.