SURFACE 



100 



PERIOD (T) 



(SECONDS) 



6 7 8 9 



200 



300 



400 



500 



600 



700 



Figure 36. The percent attenuation of wave motion with depth given the period (T) in seconds. 

 (1 foot «s 0.3 meter) (Data from U.S. Navy sources). 



69 



