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A wavy mark showing steep breaking water.
Also known as: Overfall symbol chart, Steep water symbol
On a nautical chart overfalls are drawn as wavy marks over an area where a strong stream over a sudden change of depth produces steep and breaking water.
Marks steep and breaking water where a strong stream crosses a sudden change in depth.
Contexts: Navigation
Is a more severe condition than a tide rip, which the chart distinguishes by the weight of the marking.
Contexts: Navigation
A group of short wavy lines, drawn more heavily than the tide rip mark, over the affected area.