| 摘要 |
PROBLEM TO BE SOLVED: To save waste such as a renewal replacement of a permeable side ditch resulting from a clogging due to mud or the like of the permeable side ditch. SOLUTION: Since the raw material of the main body of the permeable side ditch is composed of the raw material, which is soft and has quick shape restoration to compression, such as sponge, a rubber or the like, the side ditch can be refreshed simply even when clogged.
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