| 摘要 |
PROBLEM TO BE SOLVED: To provide an infiltration system suitable for underground infiltration of drainage water such as rain water.SOLUTION: An infiltration system 100 includes an upper structure 3, a lower structure 1 and a concrete intermediate slab 30 which partitions an interior 71s of the upper structure 3 and an interior 21s of the lower structure 1. The intermediate slab 30 includes a first opening 41 in which drainage water flows at the normal time, which has such a size that an operator can pass therethrough, and to which a detachable filter member 50 is attached, and a second opening 42 in which the drainage water does not flow at the normal time, and has such a size that the operator cannot pass therethrough. The infiltration system 100 further includes a wall part 61 which changes the second opening 42 to the opening in which the drainage water flows by forming at least a part of a flow passage F2 in which the drainage water flows to the second opening 42 via a first position P1 upper than the intermediate slab 30 when the liquid level of the drainage water is formed on the intermediate slab 30. |
