In tidal ports with a highly fluctuating water level, the surface of the quay may be built slightly above highest high water. a daily rise and fall of the tide of 15 to 18 feet or more may occur.

• 在水位波动很大的开放潮汐式港口，岸壁式码头表面应约于最高水位。潮水每天涨落的幅度可能达到15至118英尺。