A complete set of tidal current conditions, as those occurring during a tidal day, lunar month, or Metonic cycle. 
A complete set of tidal current conditions, as those occurring during a tidal day, lunar month, or Metonic cycle. 
Related Terms 
TIDAL CURRENT CHARTS

DIURNAL CURRENTTidal current in which the tidal day current cycle consists of one flood current and one eb 
SEMIDIURNAL CURRENTTidal current in which tidal day current cycle consists of two flood currents and two ebb currents, separated by slack water; or two changes in direction, 360° of a rotary current. This is the most common type of tidal current throughout the world. 
TIDAL WAVE

SLACK WATERThe state of a tidal current when its speed is near zero, especially the moment when a reversing current changes direction and its speed is zero. The term is also applied to the entire period of low speed near the time of turning of the current when it is too weak to be of any practical importance in navigation. The relation of the time of slack water to the tidal phases varies in different localities. For standing tidal waves, slack water occurs near the times of high and low water, while for progressive tidal waves, slack water occurs midway between high and low water. 
TIDE RIPSSmall waves formed on the surface of water by the meeting of opposing tidal currents or by a tidal current crossing an irregular bottom. Vertical oscillation, rather than progressive waves, is characteristic of tide rips. 
DOUBLE FLOODA flood tidal current having two maxima of speed separated by a lesser flood speed 
HARMONIC FUNCTIONAny real function that satisfies a certain equation. In its simplest form, as used in tide and tidal current predictions, it is a quantity that varies as the cosine of an angle that increases uniformly with time 
TIDAL CURRENT DIAGRAMSMonthly diagrams which are used with tidal current charts to provide a convenient method to determine the current flow on a particular day. 
OVERTIDEA harmonic tidal or tidal current constituent with a speed that is an exact multiple of the speed of one of the fundamental constituents derived from the development of the tideproducing force. The presence of overtides is usually attributed to shallow water conditions. 
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