Spectral 

 Peaks Period (h) 



3 Nov (0000 h) 

 to 

 4 Nov (1800 h) 



3 2 1.5 1.0 



Wave Period(h) 



3 4Nov(l800h) 

 to 

 6 Nov (1300 h) 



^in_ 



Figure 8. 



3 2 1.5 1.0 



Wove Period (h) 



Spectra of water levels for Pentwater Lake, Michigan, 

 for November 1974. 



20 



