From the Figure or equation (3), 
H 
ae, UWA paste 
Age = G = 3-13, 
Ss 
H. = 9.4 feet (2.9 meters). 
Ss 
(b) The exceedance percentage is 
eo x 100 = 0.0114 percent. 
From the Figure or equation (3), 
i Hs 
Hg Sy, > 85: 
H, = 10.7 feet (3.3 meters). 
Check to see if H, exceeds depth-limited height. 
ides 
H, 10.7 
From Figure 2-66 in the SPM, depth-limited breaking may be possible if 
H, 
IG 0.0172 
eT 
This condition corresponds to 
janis (a ‘ 
SN ORO a NOsOlI2 2 22.2 7 4.4 seconds. 
Since a period of 4.4 seconds or less is unreasonably short for a 10./7-foot- 
high wave at this site (see Thompson, 1977)3, depth-limited breaking is not 
expected to be a consideration in this example. 
kok kk & KK KK RK & K X & EXAMPLE PROBLEM 2 * * * *¥ & XK RX KR KX KK KK 
GIVEN: Mean significant height of approximately Hg = 3.4 feet (1.0 meter) in 
February at Nags Head, North Carolina (see Table). 
FIND: The significant height which is equaled or exceeded during 6 hours every 
February. 
SOLUTION: The exceedance percentage is 
ears x 100 = 0.89 percent 
3THOMPSON, E.F., op. cit., p. 9. 
