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  2. Chart datum - Wikipedia

    en.wikipedia.org/wiki/Chart_datum

    Mean high water springs (MHWS) is the averaged highest level that spring tides reach over many years (often the last 19 years). Within this, to ensure anomalous levels are tempered, at least two successive high waters during the highest-tide 24 hours are taken.

  3. Tide table - Wikipedia

    en.wikipedia.org/wiki/Tide_table

    Tide heights at intermediate times (between high and low water) can be approximated by using the rule of twelfths or more accurately calculated by using a published tidal curve for the location. Tide levels are typically given relative to a low-water vertical datum, e.g. the mean lower low water (MLLW) datum in the US. [2]

  4. 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 ]

  5. 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 ...

  6. Coastal management - Wikipedia

    en.wikipedia.org/wiki/Coastal_management

    Coastal zones occupy less than 15% of the Earth's land area, while they host more than 40% of the world population. Nearly 1.2 billion people live within 100 kilometres (62 mi) of a coastline and 100 metres (328 ft) of sea level, with an average density three times higher than the global average for population. [2]

  7. Nor'easter sends enormous waves crashing over beachfront homes

    www.aol.com/news/noreaster-leaves-half-million...

    The boarded windows block the view of the ocean, but he can still hear the rumbling, followed by a few seconds of respite before another wave slams against the wall.

  8. Seawall - Wikipedia

    en.wikipedia.org/wiki/Seawall

    This 300-year-old seawall effectively kept Pondicherry's historic center dry even though tsunami waves drove water 24 ft (7.3 m) above the normal high-tide mark. [ 38 ] The barrier was initially completed in 1735 and over the years, the French continued to fortify the wall, piling huge boulders along its 1.25 mi (2 km) coastline to stop erosion ...

  9. Want to build a home in a flood-prone zone? NJ soon ... - AOL

    www.aol.com/want-build-home-flood-prone...

    George Kasimos, founder of Stop FEMA Now, an organization that pushes back on high flood insurance rate hikes, said he worried about the impacts of the proposed rules on homeowners.

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