When talking about splash zones in the area of offshore constructions, like risers and jetties, this zone is the area where the external surfaces of the construction is periodically in and out of the water. The determination of the splash zone includes evaluation of all relevant effects including influence of waves, tidal variations, settlements, subsidence and vertical motions.
From all zones (atmospheric, tidal, submerged and the subsoil) covering the steel structures or piles, the splash zone has the highest corrosion rates. This is due to the high oxygen and chloride content of the recurrent splashing of seawater, which destroys any protective film that might be formed on the steel surface.
In other words the splash zone is the area of the structure where the risks of corrosion issue may rise at first because