Inland waters are classified as one of four categories:
Category A - narrow rivers and canals where the depth of water is generally less than 1.5 metres
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 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 D - tidal rivers and estuaries where the significant wave height could not be expected to exceed 2 metres at any time

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