WATER COLLECTING STRUCTURE

摘要

A water repellent sand layer that is made of water repellent sand and serves as a water shield layer is provided to be slanted between upper and lower soil layers, a water conveying belt portion is provided to include at least one or both of gravel and a culvert that are provided between the water repellent sand layer and the upper soil layer, and a water shield wall is provided at a slant downstream side. Water falling and permeating from a ground surface into the soil layer is blocked by the water repellent sand layer, flows downward in the water conveying belt portion located above the water repellent sand layer to the slant downstream side, and is blocked by the water shield wall at the slant downstream side, so that the collected water is recovered from a drain hole in the culvert that penetrates the water shield wall.

主权项

1. A water collecting structure for collecting water from an upstream side to a downstream side between a first soil layer and a second soil layer located below the first soil layer, the structure comprising:
a water repellent sand layer that is provided on the second soil layer, has an upper surface slanted downward from an upstream side thereof to a downstream side thereof, and is made of a plurality of particles to which water repellent treatment is applied; a water conveying belt portion including a gravel layer and a culvert, the gravel layer being located on the upper surface of the water repellent sand layer so as to be slanted downward from an upstream-side end to a downstream-side end and being made of a plurality of gravel particles larger in diameter than the plurality of particles with the water repellent treatment of the water repellent sand layer, the culvert being located between the water repellent sand layer and the first soil layer and being provided therein with a drain hole that is slanted downward from an upstream-side end thereof to a downstream-side end thereof, the water conveying belt portion being located on the upper surface of the water repellent sand layer and below the first soil layer and allowing water flowing from the first soil layer into the gravel layer or the drain hole in the culvert to flow from an upstream-side end of the water conveying belt portion to a downstream-side end of the water conveying belt portion; a water shield wall that is provided to surround at least the downstream-side end of the water conveying belt portion and has a through hole that the culvert penetrates; and a reservoir that stores water discharged from the drain hole in the culvert that penetrates the through hole in the water shield wall.