I wonder why sewage flows to the treatment plant. Is it because there is a slope in the sewer pipe? However, if you slope to a very long distance, it will be very deep underground, and it will not flow smoothly with a slight gradient.

The sewer is different from the water supply, and solids must also flow. Bending the pipeline like a water supply that flows Shimizu, or flowing under pressure, the pipeline will be clogged or damaged, so natural flow is planned in principle.

The gradient of the pipeline to flow naturally is determined because the slope is loose, earth and sand and filth are likely to accumulate in the pipeline, and if the slope is steeper, the flow speed will increase and the pipeline is easy to wear. .

If the main line becomes too deep in the process of flowing sewage from the branch line pipeline to the main line and the water reclamation center, a relay pumping station has been set up and pumped up, and the flow is drained naturally.