The safety of water front will be highly upgraded if no wave overtopping is expected even on rough sea. This paper presents on the development and installation experience of Flare-Shaped Revetments (Flare-Shaped Structures) with no wave overtopping, and also the results on sensitivity of design to climate change. Most of the existing coastal protective structures are designed by the expected overtopping rate method, for instance, obtaining the time averaged overtopping rate for Rayleigh distributed waves. Actual coastal waves, however, include wave groups composed of high waves and unexpected high rate of overtopping can be sometimes observed. When the landward spaces are utilized by more fragile objects such as walkers, automobiles, and residences, those exceptionally high wave overtopping is not allowed, and some devices on the performance of structures have been required.
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