On the background of construction supervision of the added flood draining facility of 4# tail pond in Dexing Copper Mine, the paper elaborates how the supervision engineers play an important role to facilitate the scientific supervision and achieve the 3 major objects of project by utilizing the knowledge, skill and experience of construction supervision.

The comparative analysis about Hydroplus and other normal type of gate such as segment gata,plain gate,automatical tilting gate,and rubber weir shows that the Hydroplus is more effective to save cost and to increase the security of the spillway equipment.