Modified-Range Ratio Method
Modified-Range Ratio Method : A tidal datum computation method. Generally used for the East Coast, Gulf Coast, and Caribbean Island stations. Values needed are mean tide level (MTL), mean diurnal tide level (DTL), mean range of tide (MN), and great diurnal range (GT) as determined by comparison with an appropriate control. From those, the following are computed: MLW = MTL - (0.5*MN) MHW = MLW + MN MLLW = DTL - (0.5*GT) MHHW = MLLW + GT