The sink is 15 --20 m in width , can adjust its structure using reclaimed water, easy to maintain the overflow weir form, with channel steel (or i-steel) framework, and inclined reinforcement, with a wooden gate. Construction with the increase of mud surface near the drain opening elevation corresponding higher ram, improve the overflow weir crest elevation of sink, in order to reduce the discharge of water slurry concentration,to prevent the secondary pollution of the water body.