20 r 



:: M 



.-7^-10 



-20 



12 Apr. 1973 Minimum Possible Profile 

 If No Exposed Pipe Was Missed) 



Artificial 

 Erosion 

 Computed 



12 Apr. 1973' 



Four Buried Pipes 

 on 12 Apr. 1973 



I L 



150 150 300 450 600 



Distance from MWL of Initial Survey (ft) 



750 



20 r 



r 10 



^. -10 



-20 



Artificial 

 Accretion 

 Computed 



12 Apr. 1973 Two Uncovered Pipes 

 on 13 Apr. 1973 

 I I I 



150 150 300 450 600 



Distance from MWL of Initial Survey (ft) 



750 



Figure 38. Profile changes between two surveys at Boca Raton, 

 showing effects of buried pipes. 



