| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a slope drain ditch of a new structure which realizes efficient drainage even in torrential rain or the like, prevents overflow at a merging part of a vertical drain ditch and a small step drain ditch by accelerating drainage especially through the small step drain ditch, and provides an effective countermeasure against collapse of a slope due to the overflow. <P>SOLUTION: The slope drain ditch is provided with a jump part on a bottom part of an inflow part to a merging part 22 with a small step drain ditch 16 in a vertical drain ditch 12. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
