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Hauteur d'assèchement

Définition

Hauteur d'un point qui découvre à basse mer, mesurée au-dessus du zéro hydrographique et indiquée sur la carte par un chiffre souligné.

Hauteur d'assèchement in practice

Drying heights are shown on charts as underlined numbers, for example 2 with a line under it means the feature dries 2 metres above chart datum. These areas are usually shaded green.

To find the depth over a drying feature: depth = height of tide minus drying height. If the result is less than your draught plus a safety margin, stay off.

Common questions

How do I read a drying height on a chart?
An underlined figure on a green area. Read '2' underlined with a small 1 as 2.1 m above chart datum.
Can I cross a drying area?
Yes, when the height of tide is greater than the drying height plus your draught and safety margin.

À voir en pratique

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