| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control board at a suitable position in a rainwater discharge chamber. <P>SOLUTION: An inflow pipe 2, an intercepting sewer 3 and a discharge pipe 4 are connected to a rainwater discharge chamber 10. A vortex flow type water level control device for drainage system includes the rainwater discharge chamber 10 and a control board 6 that is arranged in front of an opening 3a which the intercepting sewer 3 opens for the rainwater discharge chamber 10. By letting an inner diameter of the opening be D, a length that the control board 6 is projected from the opening 3a be X, and a distance between the control board 6 and the opening 3a be Y, (1) 0.5D≥X≥0.7D and 0.83D≥Y≥1.5D or (2) 0.4D≥X<0.5D and 1.0D≥Y≥1.5D. As a result, impurities is adapted to get into the intercepting sewer 3. <P>COPYRIGHT: (C)2012,JPO&INPIT |
