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accretion accuracy amount of littoral average base line Beach Erosion Board beach erosion studies beach material Beaufort Scale berm CHAPTER Charles Griffin Chief of Engineers Coast and Geodetic Commerce Coast comparison construction Corps of Engineers depth curves determine detritus direction of drift elevation extend feet field sheets Geodetic Survey Geomorphology Government Printing Office groin system high water line horizontal Hydrographic Office hydrographic survey inlet jetties lake level land in rear littoral drift low water lines MANUAL PART CXXXIII mean low water ocean OFFSHORE BREAKWATERS offshore changes Pacific Oceans petrographic photographs plotted profiles protective structures records revetment River and Harbor samples sea walls seasonal shore line changes slope sounding lines source of beach Special Publication storm action storm tides storm waves streams sufficient tide tables topographic survey TYPICAL U. S. Government Printing United States Coast volume of littoral water shore lines wave action wind roses