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  2. Chart datum - Wikipedia

    en.wikipedia.org/wiki/Chart_datum

    Similarly, the mean higher high water (MHHW) is the average height of the highest tide recorded at a tide station each day during the recording period. It is used, among other things as a datum from which to measure the navigational clearance, or air draft , under bridges.

  3. High water mark - Wikipedia

    en.wikipedia.org/wiki/High_water_mark

    One kind of high water mark is the ordinary high water mark or average high water mark, the high water mark that can be expected to be produced by a body of water in non-flood conditions. The ordinary high water mark may have legal significance and is often being used to demarcate property boundaries . [ 8 ]

  4. Tide - Wikipedia

    en.wikipedia.org/wiki/Tide

    The two high waters on a given day are typically not the same height (the daily inequality); these are the higher high water and the lower high water in tide tables. Similarly, the two low waters each day are the higher low water and the lower low water. The daily inequality is not consistent and is generally small when the Moon is over the ...

  5. Seawall - Wikipedia

    en.wikipedia.org/wiki/Seawall

    An example of a modern seawall in Ventnor on the Isle of Wight, England People socializing and walking at the Malecón, Havana Seawall at Urangan, Queensland. A seawall (or sea wall) is a form of coastal defense constructed where the sea, and associated coastal processes, impact directly upon the landforms of the coast.

  6. Hurricane Helene storm surge spared few areas along the ... - AOL

    www.aol.com/hurricane-helene-storm-surge-spared...

    But tidal gauge measurements above the mean higher high-water line (basically dry ground) tell at least part of the story. ... Less than 24 hours later, about 300 miles of coastline from the Keys ...

  7. Air draft - Wikipedia

    en.wikipedia.org/wiki/Air_draft

    The vessel's clearance is the distance in excess of the air draft which allows a vessel to pass safely under a bridge or obstacle such as power lines, etc.A bridge's "clearance below" is most often noted on charts as measured from the surface of the water to the underside of the bridge at the chart datum Mean High Water (MHW), [3] [4] a less restrictive clearance than Mean Higher High Water ...

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  9. Baseline (sea) - Wikipedia

    en.wikipedia.org/wiki/Baseline_(sea)

    A baseline, as defined by the United Nations Convention on the Law of the Sea, is the line (or curve) along the coast from which the seaward limits of a state's territorial sea and certain other maritime zones of jurisdiction are measured, such as a state's exclusive economic zone. Normally, a sea baseline follows the low-water line of a ...