| 摘要 |
PROBLEM TO BE SOLVED: To prevent a counterlfow to the other drainage channel side from one drainage channel side and the occurrence of inconvenience such as a large depth drainage machine station is flooded by rapidly reducing a rise in a water level of a water suction tank by an upsurge phenomenon when a drainage pump reluctantly stops. SOLUTION: A driving prime mover stops by the occurrence of failure or the like, and when operation of a drainage pump P is stopped, in the case of the relationship of (a water level of a delivery place 7 < a water level of a water suction tank 1), a check valve 11 is interposed to allow only the flow to the delivery place 7 side from the water suction tank 1 side by a water level differenceΔH3. Water of the water suction tank 1 is drained to the delivery place 7 through a bypass passage 10.
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