Wave overtopping is an important factor for designing harbor breakwater and shore-protection structure, and the safety of facilities, working areas and people in their lee. This paper reports the results of a series of laboratory experiments on the effect of six types of wave energy dissipation mechanisms on wave overtopping over a bermed seawall that protects a reclaim land for a specialized yacht industry zone in Taiwan. Numerical method using NN-Overtopping is also applied to determine suitable building setback distance for storm in different recurrent periods.