| 摘要 |
PROBLEM TO BE SOLVED: To provide a subsurface drainage pumping station using a subsurface discharge channel performing closed channel application, effectively preventing surging phenomenon from being generated in the case of abnormal stop of a pump, eliminating the need of a large installation area, and having a high reliability.SOLUTION: A drainage pumping station includes: a suction sump 3 configured to be connected to an inflow channel 2 performing closed channel application and to have a free surface; a pump 4 for transferring water in the suction pump 3 to a predetermined discharge place; and a pressure regulating partial tank 6 communicating with the suction sump 3 and extending from the suction sump 3 upward. The pressure regulating partial tank 6 communicates with an overflow channel 8 communicating with the discharge place 5 via an overflow weir 7 higher than a planned maximum water level of the discharge place 5. |
