Debris flow in Hunshui Gully (4.5km2) is most active and haxardous in the basin of Daying River. It transported 1.5

×10^6 t of sediment into Daying River and resulted in serious haxards every year before it was put under contol. 7 trap dams, 9 check dams, 10 submerged dams and a chute of 570m long have been completed. As a result of the works, 4.5×10^6 m^3 of sediment had been captured, 80% of landslides stopped and debris flows reduced largely, as well as annual sediment transportation is reduced to about 5.0×10^4 t. The whole mitigation project will be completed by

2000.