1 r 



1 r 



n=4 



80 



70 



60 



50 ± 

 < 



40 



30 



20 S2 



cr 

 o 



- 10 



10 20 30 40 50 60 70 80 90 100 110 120 140 



TIDAL CYCLES 



FIGURE 3 GENERAL FLUSHING CURVES 

 13 



