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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 tables forecast the time of the next high water. [6] [7] The difference between these two times is the lunitidal interval. This value can be used to calibrate tide clock and wristwatches to allow for simple but crude tidal predictions. Unfortunately, the lunitidal intervals vary day-by-day even at a given location.
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).
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.
The river rises on the northern slopes of the Liverpool Range, at the junction of the Great Dividing Range and Mount Royal Range, south of the village of Nundle, and flows generally north, west and north west and emerges into the Liverpool Plains near Tamworth.
There is only limited movement of water between the lakes and sea through a narrow channel at The Entrance, and hence tides in the main body of the lakes are negligible. On occasions, this channel has slowly silted up with sand and the lakes have been completely cut off from the Pacific Ocean until a large flood scours out the channel again.
Pittwater is a semi-mature tide dominated drowned valley estuary, [2] located about 40 kilometres (25 mi) north of the Sydney central business district, New South Wales, Australia; being one of the bodies of water that separate greater Metropolitan Sydney from the Central Coast.
From the middle reaches of its course, the state boundary between New South Wales and Queensland is located approximately 10 kilometres (6.2 mi) north. The river rises on the eastern slopes of the Great Dividing Range ; with its watershed bordered by the McPherson , Burringbar, Condong and Tweed ranges and containing a catchment area of 1,055 ...