was employed in the design evaluation. All designs were subjected to the 
total number of hurricane and northeaster storm events. 
172. Design A: 100-ft berm width. Recession-recurrence plots for 
Design A are shown in Figures 4O (hurricanes) and 41 (northeasters). The 
combined design curve is shown in Figure 42. The combined computations indi- 
cate maximum recession values of 60 ft corresponding to a frequency of occur- 
rence of approximately 100 years. This value is comparable to the average of 
the reported recessions for the November 1953 northeaster (Table 9), although 
it has previously been noted that the measured recessions are most likely the 
product of multiple storms. Assuming the 98-ft average recession value for 
the +10 ft contour (CE 1954) is an overestimate for the single November storm, 
the 100-ft berm width design would appear to provide protection to the degree 
that computed recessions would only reach the seawall as a result of storms 
with recurrence intervals greater than 100 years. 
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RECURRENCE INTERVAL (YEARS) 
DESIGN A: 100-FT BERM WIDTH HURRICANES 
Figure 40. Hurricane recession-recurrence plot for 
Design A: 100-ft berm width 
93 
