The pipe is made of red water and rainwater. The specially designed water bucket is used to make the rainwater in the shallow water depth of the bucket. It can form a full flow state in the pipeline, and utilize the height of the building and the potential energy of the falling water. A partial vacuum is created, which causes additional pressure on the water flow in the rainwater bucket and the horizontal pipe to form a red suction phenomenon. By using the cylinder suction function, the flow rate of water in the drain pipe is greatly accelerated, and the roof rainwater is quickly discharged.
