| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete-made ditch cover capable of making rainwater rapidly flow to both sides in the stream direction and enhancing a draining capacity. SOLUTION: The concrete-made ditch cover 1 is put on the side ditch body forming a water course on the surface of the concrete-made ditch cover 1, a plurality of ditches 2, 2, 2, 2 extending in parallel to a water course are recessed, The respective ditches 2 are formed with a left inclined bottom face 2b and a right inclined bottom face 2c descending to both end sides from a central ridge 2a. COPYRIGHT: (C)2005,JPO&NCIPI
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