As the construction of the new harbour area causes the constraction of river width, flow velocity either in flood or in ebb will then be increased and the siltation amouut in the harbour basin and the navigable channels would also be decreased.

• 珠江是多水少沙河流,建新沙港后河道缩窄,涨、落潮流速有所增加,也可以减少泥沙的回淤量。