20.0 3.0 



1.4 1.0 



0.7 



Period (hr) 

 0.5 



0.4 



0.3 



Lake Michigan 

 Pentwater Lake 



5.3 Forcing Period (hr) 



L25 



0.65 



rrhr-i« 



-A' 



_/i ^ 



_u_ 



0.38 0.73 1.08 



1.43 1.78 2.13 2.48 2.84 3.19 3.54 

 Frequency (c/hr) 



Pentwater Lake 



Lake Michigan 



Figure 19. Sample Pentwater and Lake Michigan water levels and spectra. 



49 



