WebTrinity High Water (or High Water, Trinity Standard ), abbreviated T.H.W., was a vertical datum used for legal purposes in the River Thames and informally over a much wider area. Though not thus defined, it was about 12 feet 6 inches above mean sea level. [13] [14] WebMHWN - mean high water neaps MLWN - mean low water neaps The height of mean high water neaps is the average throughout the year (when the average maximium declination of the moon is 23.5°) of two successive high waters during those periods of 24 hours when the range of the tide is at its least.

Tides for Trearddur Bay, Wales - BBC Weather

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Passage through the Swellies – Caernarfon Harbour Trust

WebHolyhead Breakwater is situated at the north-western end of Holyhead in Anglesey in North Wales. The Victorian structure, which is 1.7 miles (2.7 km) long, is the longest breakwater in the United Kingdom. [1] The breakwater, which is accessible in good weather, has a promenade on top which leads out to the Holyhead Breakwater Lighthouse. [1] WebHigh water takes place at eight hours and a half after the moon's transit. Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2] Phillip Parker … WebApr 7, 2008 · Holyhead, years 2008 to 2026. Highest astronomical tide 6.33m. Mean high water springs 5.66m. Mean high water neaps 4.51m. Mean low water neaps 2.02m. Mean … dewitt township michigan fire department