Still Water Level
Abstract water level typically used for the calculation of wave kinematics for global actions and wave crest elevation for minimum deck elevations
NOTE Still water level is an engineering abstract calculated by adding the effects of tides and storm surge to the water depth but excluding variations due to waves (see Figure 1). It can be above or below mean sea level.
Source: API RP 2MET, Derivation of Metocean Design and Operating Conditions, First Edition, November 2014. Global Standards