UNDERGROUND INFILTRATION TYPE WATER CHANNEL BLOCK AND WATER CHANNEL USING THE SAME

PROBLEM TO BE SOLVED: To provide an underground infiltration type water channel block for which it is not necessary to perform periodical maintenance for maintaining water permeability, and a water channel using the same.SOLUTION: When water W such as rainwater flows into a water channel 14 and passes through an underground infiltration type water channel block 1, a portion of the water W is transmitted through a gravel layer 12 from an opening 9 and penetrates from the bottom of a groove M into a subsurface U. As a headrace channel 13 is gradually reduced in width dimension toward the opening 9, the flow rate of the water W becomes faster as it flows in the headrace channel 13, and the water flows on the opening 9 with vigor. Therefore, even when sludge or dust G is contained in the water W, the sludge or dust G flows along with the water W to the downstream side without sedimentation on the gravel layer 12. 【課題】透水性を維持するための定期的なメンテナンスを行う必要のない地下浸透型水路ブロックおよびそれを用いた水路を提供する。【解決手段】雨水等の水Ｗが水路１４に流れて地下浸透型水路ブロック１を通過すると、一部の水Ｗは開口９から礫層１２を透り、溝Ｍの底から地下Ｕへと浸透していく。導水路１３は開口９に向かって幅寸法が徐々に小さくなっているため、水Ｗは導水路１３を流れるにつれて、その流れが速くなり、開口９の上を勢いよく流れる。従って、水ＷにヘドロやゴミＧが含まれていても、ヘドロやゴミＧは水Ｗとともに下流へ流されるため、礫層１２に堆積することはない。【選択図】 図７