| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete basin which internally has a sediment pan, from which the sediment pan can be easily taken out even when sediment is hardened due to long-term use, and which enables easy discharge of the sediment accumulated on a bottom.SOLUTION: In a concrete basin 100 such as a gully, a catch basin and a reservoir basin, a bottom surface 12 has a bottom-surface central part 12a that is formed the lowest in or near the centers of side-wall inner surfaces on both opposed sides, and bottom surface parts 12b on both sides, which are provided in such a manner as to be inclined toward the side-wall inner surfaces on both the sides from the bottom-surface central part. |
