The motions of water in ebb and flood currents, driven by the gravitational attraction of the Sun and moon on the Earth, at times influenced by wind events. Distributions are observations of tidal height, currents, and cycles, at specific locations and times, and they include maps of tidal climatology based on combinations of observations, astronomy, hydrodynamic theory, and numerical models. Assessments evaluate tidal energy potential, technologies, and risks; model the effects of tides on other uses; and evaluate risks associated with extreme tides. Predictions are the results of models or projections of future tidal climatology, tidal energy potential, effects, and risks; these data include predicted changes due to economic, regulatory, technological, and environmental changes.