When do tidal currents reach their maximum velocity?
a. Midway between slack water and high tide
b. During the period of slack water
c. Midway between high and low tide
d. Midway between low tide and slack water
ANS: C
The maximum velocity of a tidal current is midway between a high and low tide. Slack water is a
period of still or calm water. This is when the currents begin to shift direction. Information can be
found in the section The Dynamic Theory of Tides Adds Fluid Motion Dynamics to the Equilibrium
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