| 摘要 |
PURPOSE: A drainage system of a building is provided to heighten the utilization of resources by using rainwater to clean up a veranda. CONSTITUTION: The drainage system(200) of building comprises the steps of installing a drainpipe(210) on a lateral water collecting device of the rooftop, installing a water collecting device(220), an inlet pipe(230) and a lower support(240) on the lower part, fixing the water collecting device(220) and the lower support(240) by welding, and draining off the overflowing rainwater in the water collecting device(220) to the lower part through a drainage guide pipe(250). |
