This paper describes an innovative steel structure and installations forscouring prevention adopted in the spillway of the debris flow controlproject in Luhua Ravine of Heishui county

Sichuan province. The struc-ture is designed as

at the joint of lateral bottom and air face downstream the spillway of check dam

a 8-rocm thick steel plate was used to make a steel part which extrends out 50cm from the downstream air faceand rises 10-15cm

welded on double threading steel bar 25mm in diame-ter

it was casted into a steel bar-reinforced stopper

No. 200 in 50cm

connected with the check dam as a whole. Check dams with a spillwaystructured in this way can retain a layer of debris flow and play a role ofenergy dissipation and cushioning. When the following debris flows cro-ss the dam

the external force of direct scouring

friction

impact andundercut exerted on the dam by debris flow would be transformed intothe inner stress of stone against stone and sand against sand inside deb-ris flow

thus protecting the dam outled from the damage by debris flowwhich would cause the destruction of the whole dam.