Based on insitu experiment and practice, the layout and structure of sump of Chambishi Copper Mine and mines in china are compared adequately, and the advantages of the sump layout and structure in Chambishi mine are expounded, for example, it is useful for sludge settling and sump cleaning and so on.

Fuli mine uses the technology of water sump cleaned with water replacing artificial water sump cleaning.

This paper introduced the tailrace dredging at Hongshi hydropower station and analysed its profit.