This animation shows the relationship between tides and currents. As the tide rises, water moves toward the shore. This is called a flood current. As the tide recedes, the water moves away from the shore. This is called an ebb current. The movement of water toward and away from the shore is illustrated by the movement of the green seaweed. Tidal currents that ebb and flood in opposite directions are called “rectilinear” or “reversing” currents.