The peak height of the water is only one factor that contributes to the damage a tsunami may cause. Just as mportant is the speed of the water. Look at the wave around 22:00 hour. 12. What is the range (total water level fluctuation from crest to trough) from the crest at 22:00 to the trough just after 22:00? 13. How much time did it take for the water to go from this peak to trough?