Sewage
Water contaminated by use or runoff from paved surfaces is collected and drained away.
We differentiate between 4 types of wastewater according to their origin: precipitation water (NSW) or rainwater (RW), dirty water (SW), foreign water (FM) and mixed water (MW). There are 4 drainage systems: precipitation or rainwater sewer (KR), dirty water sewer (KS), mixed sewer (KM), and pressure and negative pressure systems.