Although it is difficult to collect

Although it is difficult to collect hard evidence on such extreme wave phenomena because of the low possibility of their occurrence, observational evidence suggest that in case of large surface elevations, the probability distribution for the surface elevation deviates substantially from the Gaussian distribution. To determine the probability of extreme events and understand the occurrence of rogue waves, the kurtosis of the surface elevation probability distribution has shown mostly determined well by the square of BFI value, even for waves with a narrow banded spectrum and large steepness, where a significant amount of wave breaking, limiting the height of these waves, as well as affecting the extreme statistics.