Enhancing the function of flocculation settling, to reduce the load of existing inclined tube sedimentation tank and air water backwash filtration tank.Construction scale: 600,000m3/d,Investment: CNY93 million,China Zhan Tianyou Civil Engineering Award 2000,Second prize of CSCEC excellent investigation and design award 2009-2010,Second prize of national excellent investigation and design industry award 2013,Second prize of Gansu provincial excellent engineering investigation and design award 2013