LENGTH OF V/AVE - The horizontal distance between similar points on two 

 successive waves measured perpendicularly to the crest« (See 

 Figure A-3) = 



LEVEE - A dike or embankraent for the protection of land from inundation. 



LMT OF BACKRUSH) gee BACKWASH. 

 LIMIT OF BACKVJASH 



LITTORAL - Of or pertaining to a shore, especially of the sea. A coastal 

 region. 



LITTORAL CURRENT - The current near the shore of an ocean or other body 

 of water. 



LITTORAL DEPOSITS - Deposits of littoral drift. 



LITTORAL DRIFT - The material moved in the littoral zone under the in- 

 fluence of waves and currents. 



LITTORAL TRANSPORT - The movement of material along the shore in the 

 littoral zone by waves and currents. 



LONGSHORE CURRENT - A current in the surf zone moving essentially parallel 

 to the shore, usually generated by waves breaking at an angle to the 

 shore line, 



LOWER HIGH WATER (LHW) - The lower of the two high waters of any tidal 

 day, (See Figure A-IO) . 



LOWER LOW WATER (LLW) - The lower of the two low waters of any tidal 

 day. The single low water occurring daily during periods when 

 the tide is diurnal is considered to be a lower low water. (See 

 Figure A-IO) . 



LOW TIDE (LOW WATER, LW) - The minimum height reached by each falling 

 tide. See TIDE. (See Figure A-IO) 



LOW WATER DATUM - An approximation to the plane of mean low water that 

 has been adopted as a standard reference plane. See also DATUM 

 PLANE. 



LOW MTER LIIME - The intersection of any standard low tide datum plane 

 with the shore. 



LOW WATER OF ORDINARY SPRING TIDES (LWOST) - A tidal datum appearing in 

 some British publications, based on low water of ordinary spring 

 tides. 



A-18 



