Definition
A channel maintained by dredging to a stated depth below chart datum, shown on the chart with its dredged depth and the date of dredging, and usually edged by lateral marks or covered by a leading line. Available water equals the dredged depth plus the height of tide, but siltation between surveys can make the charted figure optimistic, so a deep-draught vessel should confirm the port's latest declared depth and any notices before entry.
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