In the closing phase (Phase 1), the retention space that is used to back up the wastewater flowing off is partly sealed (Phase 2) by means of the flush gate above the sewer section to be cleaned.
When the momentum of the hydrostatic pressure (Mo) acting above the rotation axis is higher than the momentum resulting from the pressure acting below the rotation axis (Mu), the flush gate is shifted into a horizontal position (Phase 3) and the backed up water flows in a surge wave into the sewer section downstream (Phase 4). Once a lower water level (that depends on the local circumstances) is reached in the upstream, the flush gate is automatically turned back into the starting position (Phase 1) and the cycle starts again.
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