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A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. [1] Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW).
The river runs southeastward, with New Hampshire to the south and west and Maine to the north and east, and empties into the Gulf of Maine east of Portsmouth, New Hampshire. The last 6 miles (10 km) before the sea are known as Portsmouth Harbor and have a tidal current of around 4 knots (7.4 km/h; 4.6 mph). [1]
Tide tables, sometimes called tide charts, are used for tidal prediction and show the daily times and levels of high and low tides, usually for a particular location. [1] 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 ...
Tide flow information is most commonly seen on nautical charts, presented as a table of flow speeds and bearings at hourly intervals, with separate tables for spring and neap tides. The timing is relative to high water at some harbour where the tidal behaviour is similar in pattern, though it may be far away.
Portsmouth was established as a town with a royal charter on 2 May 1194. [8] [9] The city is home to the first drydock ever built. It was constructed by Henry VII in 1496. [10] Portsmouth has the world's oldest dry dock, "The Great Stone Dock"; originally built in 1698, rebuilt in 1769 and presently known as "No.5 Dock". [11]
Tidal range is the difference in height between high tide and low tide. Tides are the rise and fall of sea levels caused by gravitational forces exerted by the Moon and Sun, by Earth's rotation and by centrifugal force caused by Earth's progression around the Earth-Moon barycenter. Tidal range depends on time and location.
View of the Solent from Gurnard, near Cowes, Isle of Wight The Solent from Wootton, Isle of Wight, showing Wightlink Fishbourne–Portsmouth ferries crossing.. The Solent (/ ˈ s oʊ l ən t / SOH-lənt) is a strait between the Isle of Wight and mainland Great Britain; the major historic ports of Southampton and Portsmouth lie inland of its shores.
Portsmouth Island is a tidal island connected, under most conditions, to the northern end of the North Core Banks, across Ocracoke Inlet from the village of Ocracoke. The town lies in Carteret County , was established in 1753 by the North Carolina Colonial Assembly, and abandoned in 1971.