The analytical solution for the return period R≥2(H) of a sea storm having at least two individual waves higher than a fixed level H, is obtained. This solution is based on the application of the Boccotti's Equivalent Triangular Storm model for the representation of actual storms. One of the corollaries of the solution gives the exact expression for the probability that at least two waves higher than level H are produced during the lifetime of a structure. The previoussolution of R≥2(H) and the relative probability of exceedance can be effectively applied for the risk analysis of ocean structures.The results obtained show an excellent agreement with those achieved by considering the different approach, proposed by Arena and Pavone (2009), for the calculation of the returnperiod R≥2(H).
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