A all rhywun helpu? Dyma ddiffiniad:
HAT - Highest astronomical tide
LAT - Lowest astronomical tide
Highest astronomical tide (HAT) is the highest level, and Lowest
astronomical tide (LAT) the lowest level that can be expected to occur
under average meteorological conditions and under any combination of
astronomical conditions. HAT and LAT are not extreme levels, as certai
meteorological conditions can cause a higher or lower level, respectively.
Diolch
Siān
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