Configuration 10 is presented in Plate 10. This configuration has offshore 

 water depths somewhat shallower than those for the other configurations. It 

 was being considered for sheltered areas along Broad Sound (Reaches A through 

 D, Figure 2) and was not intended for use on the open coast (see Hardy and 

 Crawford (in preparation) for details related to the strategy for reducing 

 flooding at Roughans Point). In the model the shallower offshore depths were 

 achieved by lowering the reference water level 1.6 ft. As a result there is 

 greater truncation of the large waves in the wave height distribution for this 

 configuration than for the other configurations, and the results cannot be 

 compared. Attempting to compare the results leads to the conclusion that a 

 standard revetment fronting a sheet-pile seawall is unusually effective in re- 

 ducing wave overtopping when contrasted to a standard revetment fronting the 

 recurved seawall. The reason for the anomaly appears to be that overtopping 

 rates are unusually sensitive to a few large waves, and there are not many of 

 these large waves because of the shallow offshore water depths used for 

 Configuration 10. 



29 



