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An outlined area where dredged material is dumped.
Also known as: Dumping ground symbol, Disposal area chart symbol
On a nautical chart a spoil ground is drawn as an outlined area marking water designated for the disposal of dredged material, where depths may change without notice.
Marks an area designated for the disposal of dredged material.
Contexts: Navigation
Warns that charted depths inside it may be out of date at any time, since the whole purpose of the area is that material is added to it.
Contexts: Navigation
A dashed outline enclosing the area with a note identifying it as spoil ground.