| 摘要 |
PROBLEM TO BE SOLVED: To provide a drainage system allowing drain water to converge while restricting the energy reduction of drain water in a horizontal drain pipe.SOLUTION: The drainage system is a drainage system 100 disposed at an inclination of 1/5 or less, including a horizontal drain pipe and a reduced-diameter part 120 having the reduced inner diameter of a pipe. The reduced-diameter part 120 is formed at the inside adjacent to the bent joint 140 to be connected to the drainage system 100.SELECTED DRAWING: Figure 3 |
