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Page Title: Frequency of erosion for the combined impacts of tropical and extratropical storms
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Figure G8.
Mean value with error limits for frequency of vertical erosion from tropical storms for 8-ft
mound located at 83-ft depth, crest depth of 75 ft
mound at the 83-ft depth. Table G9 summarizes the frequency-of-occurrence of
vertical erosion from extratropical storms for all six mound configurations in the
form of a mean value and +/- standard deviation error that can be added to or
subtracted from the mean value.
Frequency of erosion for the combined impacts of tropical and
extratropical storms
For most sites it is probably only practical (and cost effective) to replace any
lost cap material due to erosion on a yearly basis. Therefore, for sites that
experience both tropical and extratropical storms, the potential for vertical
erosion from the combined impacts of both types of storms over a year's time
must be considered. Proper design of a cap should consider both the episodic
erosion from the less frequently occurring severe storms and the cumulative
erosion from normal storm activity (average intensity storms experienced every
year) experienced over a period of years. If this is not done, then after say 5 to
20 years of annual erosion, the remaining erosion thickness could fall below the
design level (say a 100-year return frequency erosion event).
G25
Appendix G Procedures for Conducting Frequency-of-Erosion Studies

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