| 摘要 |
PROBLEM TO BE SOLVED: To provide facilities for storage and/or permeation of rainwater or the like in which inflow sand or sludge together with rainwater are conducted and collected in a specified position, sucked out by vacuum or the like, cleaned away, and removed, and further, even if sand or the like settle in the storage section after long time use, they can be removed, the inside volume can be sufficiently secured. SOLUTION: Rainwater or the like are stored and/or permeated in the underground position by the facilities. A first filling member provided with a guide means guiding rainwater or the like to a required direction by the gravity and/or rainwater flow is disposed in the bottom of a storage tank. A second filling member having a specified porosity and a sufficient strength even if it is connected vertically and laterally and embedded underground, is disposed on the top thereof. The whole facilities are embedded underground. COPYRIGHT: (C)2004,JPO
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