| 摘要 |
PROBLEM TO BE SOLVED: To store rainwater even when an infiltration pipe is set in the ground of a geological feature having a slow infiltration speed of rainwater or the quantity of the rainwater flowing into the infiltration pipe is small, and enhance the infiltration efficiency by providing a weir for regulating the level of the water passing in the infiltration pipe on the end part inside or inside intermediate part of the infiltration pipe. SOLUTION: An infiltration port 1b having a filter 2 is formed on the side wall 1a of a square box culvert 1 forming an infiltration pipe, so that the rainwater passing in the box culvert 1 is infiltrated into the ground while filtering the dust or mud carried by the rainwater. A weir 3 lower by a prescribed dimension from a top board 1d is provided in the space by both side walls 1a and a bottom board 1c on the end part inside of the box culvert 1. By providing the weir 3, the water passing in the box culvert 1 can be stopped and stored with the level being regulated to delay the outflow time of rainwater. Accordingly, even when the infiltration pipe is set in the ground of a geological feature having a slow infiltration speed, or the inflow quantity of rainwater is small, the rainwater can be stored to improve the infiltration efficiency.
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