WEMo (Wave Exposure Model) is a simple hydrodynamic model that calculates the wind wave exposure of a site (Murphey and Fonseca 1995, Fonseca and Bell 1998). WEMo helps coastal managers and ecologists with tasks of estimate wave parameters in coastal and estuarine environments since hydrodynamic factors can profoundly impact the environment in coastal areas. This involves estimating the wave energy reaching the shoreline taking into account the effects of wind, local topography and bottom. WEMo was designed to bridge the gap between ecologists and managers on one hand, and physical hydrologists on the other by providing a user-friendly access to quantitative forecasts of wave energy in estuarine environments. WEMo's two distinct modes: Representative Wave Energy or RWE mode and Relative wave Exposure Index or REI mode uses different approach to calculate wave exposure. RWE mode is based on linear wave theory and is implemented with a wave ray technique in a monochromatic approach. REI mode on other hand uses an empirical approach based on inverse-distance -weighting function (IDW) of bottom depth applied to wave rays (Murphey and Fonseca 1995). Selection of WEMo mode depends on the project requirement, geographical area for the study and time scale used in the study.