A poster of a city with a river and buildings

Sewer Day People about promoting the development of sewerage systems々Calling for understanding and cooperation、Ministry of Construction in 1961（Current Ministry of Land, Infrastructure, Transport and Tourism）Established by。This is because this period is 220 days, which is the 220th day counting from risshun, and flood damage caused by typhoons is likely to occur.、This time of year was chosen as the best way to appeal to the sewer system.。