Note that if the average wavelength of some waves is 30 feet, the depth one would need to dive down to reach the wave base so that you would not experience the forced movement of the water is: 1.5 feet.
What is the justification for the above result?
First, note that the depth at which the water's motion is no longer influenced by the waves is known as the wave base. In general, the wave base is located at a depth that is approximately 1/20 of the wavelength of the waves.
Using the above information or relationship, we can state that:
The depth that we need to dive to is:
30feet x 1/20
= 30 x 0.05
= 1.5 feet.
Thus, the depth at which one would need to dive in order to escape the force fo the waves is 1.5 feet.
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