Sewerage and Drainage Equipment

Role and mechanism of sewer (we link to page of sewer River Bureau) (outside site)

Drainage facilities are facilities such as drain pipes for draining sewage from kitchens and toilets and rainwater that has fallen on the premises to drain pipes. Maintenance will be carried out by everyone.
Drainage facilities have the following differences depending on whether the sewer at which the connection destination is a combined or diverted type.

This is a method of combining sewage and rainwater into the sewer with a single drain pipe.

This is a method of separating sewage and rainwater and flowing them into sewage pipes and rainwater pipes, respectively. Don't drain the sewage into the rainwater pipe.
In addition, rainwater may flow into a U-shaped ditch.

The area where the sewer has been maintained and the sewage can be treated at a sewage treatment plant is called a "treatment area." Those who own buildings in the treatment area are obliged to wash water.
Washing work refers to the following work.

Installation of drainage facilities for draining water from toilets and kitchens into the sewer must be made without delay after the treatment area. (Article 10 of the Sewerage Law)
If the sewer system is diverted, the drainage system must have a structure that separates the sewage into sewage and rainwater and flows into the sewer. (Article 8 of the Sewerage Enforcement Order)

The toilet must be converted to a flush toilet within three years after it becomes a treatment area. (Article 11-3 of the Sewerage Law)

If a septic tank is used even in a flush toilet, the septic tank must be abolished within three years after it becomes a treatment area. (Yokohama City Sewerage Ordinance, Article 15)
In addition, when we abolished septic tank, we must submit septic tank abolition report within 30 days. (Article 11-2 of the Septic Tanks Act)
After abolishing the function of the septic tank and cleaning and disinfecting, we will do it in the following two ways.