In Japan, the combined sewer system is employed in cities which have, from early on, been engaged in the creation of sewage works. However, when there is a heavy rainfall in such cities, the water flowing into the combined sewer pipes increases and untreated combined sewage, i.e. a
mixture of wastewater and storm water, flows out into the public water body and it is concerned about influences on public health. Therefore in Japan, the improvement goals for the combined sewer system so far are: 1) reducing the contamination load, 2) ensuring public health and safety, and
3) reducing debris. Out of three goals, the applicability for various types of combined sewer overflow (CSO) chambers and superiority as easy operation & maintenance works and reasonable costs have been required for the debris reduction technology. Therefore, we developed the Water Surface
Control Device without the use of power and nor the moving parts.
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