Trench excavation by grab dredger and install a submarine water main of 1200 mm diameter and a length of 2.1 km. The total dredged volume of marine sediment is about 362,000 m3.

• 工程主要涉及以抓斗挖掘管槽，敷设一条直径1200毫米和长度2.；1公里的海底供水管道。挖出的沉积物总体积估计约达362；000立方米。