SUPERNATANT WATER DISCHARGE DEVICE

摘要

Provided is a supernatant water discharge device that can prevent overflow of a sedimentation basin due concentrated heavy rain. This device is provided with: a submersible pump (10) provided in a sedimentation basin; a float member (30) that makes the submersible pump (10) float on the water surface; a distance sensor (41) that measures distance to sediment (S); an anemometer (42); and a control device (50) that stops the submersible pump (10) when a measurement value of the distance sensor (41) or the anemometer (42) reaches a threshold value. Concentrated heavy rain is predicted, and discharge of supernatant water (W) to a second sedimentation basin (P) can be stopped; therefore, overflow from the second sedimentation basin (P) because of concentrated heavy rain can be prevented. If the sediment (S) gets close to the submersible pump (10) because of a drop in the water level or a rise in the height of the sediment, the submersible pump (10) can be stopped; therefore, failure of the submersible pump (10) caused by suction of solids can be prevented.