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Tidal river3/27/2023 Water categorisation matters are co-ordinated by the Hydrography, Meteorology and Ports Branch of the MCA. You can make a request for the categorisation - or re-categorisation - of a defined area of water as long as you hold an interest in the area requested. Because of this, it is important that the area you conduct your business in is correctly categorised. Inland waters are not regarded as ‘sea’ for the purposes of Merchant Shipping legislation and vessels operating in categorised waters have different construction and equipment standards. Applications for categorisation of waters You can also download MSN 1837 (M) Amendment 2 on the categorisation of waters (PDF,554.50KB). Water categorisation policy and processes are dealt with by MCA. These categorisations determine the waters not regarded as ‘sea’ for the purposes of most Merchant Shipping legislation, except that, for marine pollution legislation, ‘sea’ normally includes any estuaries or arms of the sea, and therefore tidal Category C, and Category D, waters. Category D - tidal rivers and estuaries where the significant wave height could not be expected to exceed 2 metres at any time.Category C - tidal rivers, estuaries and large, deep lakes and lochs where the significant wave height could not be expected to exceed 1.2 metres at any time.Category B - wider rivers and canals where the depth of water is generally 1.5 metres or more and where the significant wave height could not be expected to exceed 0.6 metres at any time.Category A - narrow rivers and canals where the depth of water is generally less than 1.5 metres.Inland waters are classified as one of four categories: ‘Inland waters’ includes any area of water not categorised as ‘sea’ - eg canals, tidal and non-tidal rivers, lakes, and some estuarial waters (an arm of sea that extends inland to meet the mouth of a river). Inland waters and how they are categorised It is aimed at owners, operators and Masters of vessels operating in all inland waters categories. This guide explains what inland waters are, how they are categorised, how to apply for categorisation of waters, safety requirements for vessels operating on inland waters, and best practice to adopt. These categories are defined and listed in Merchant Shipping Notice ( MSN) 1776. Inland water categorisation policy and processes are dealt with by the Navigation Safety Branch ( NSB) of the Maritime and Coastguard Agency ( MCA). This includes canals, non-tidal rivers, tidal rivers, large, deep lakes and lochs, and estuaries. Inland waters are categorised as A, B, C or D. There are no national construction requirements for private pleasure vessels. Construction requirements and levels of safety equipment that must be carried on vessels in the UK depend on the nature of the waters in which the vessel operates. The UK has over 4,000 miles of inland waterways.
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