WATERLINE - A juncture of land and sea. This line migrates, changing 

 with the tide or other fluctuation in the water level. Where 

 waves are present on the beach, this line is also known as the 

 limit of backrush. (Approximately the intersection of the land 

 with the Stillwater level.) 



WAV£ DIRECTION - The direction from which a wave approaches. 



WAVE HEIGHT - The vertical distance between a crest and the preceding 

 trough. 



WAVELENGTH - The horizontal distance between similar points on two 

 successive waves measured perpendicular to the crest. 



WIND SETUP - (1) The vertical rise in the Stillwater level on the 

 leeward side of a body of water caused by wind stresses on the 

 surface of the water. (2) The difference in Stillwater levels on 

 the windward and the leeward sides of a body of water caused by 

 wind stresses on the surface of the water. (3) Synonymous with 

 Wind Tide and Storm Surge. Storm Surge is usually reserved for 

 use on the ocean and large bodies of water. WIND SETUP is usually 

 reserved for use on reservoirs and smaller bodies of water. 



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