Drainage system: What is direct drainage and what is surface drainage?

1. Direct drainage means that the sewer pipe drains directly through this floor.

2. Ground drainage means that when installing the basin, the drain pipe under the basin is directly inserted into the ground drain pipe. The bathroom and floor drain drain pipe of this floor pass through the floor, make a bend at the roof below, and then walk into the drain pipe. This kind of ground drainage wants to change the position of washbasin and toilet, but in most cases it is difficult to do so, because the position of pipes reserved in the building cannot be changed.

3. Sewage collection system refers to the drainage facilities for collection, transportation, water quality treatment and discharge that are combined in a certain way.