Primary wastewater line (PAA) All hydraulically relevant lines where the water flows due to the slope.

Secondary wastewater line (SAA): All hydraulically irrelevant lines in which the water is transported via the gradient. Their topology can be recorded in a simplified manner (however, the UtilityNetwork topology must be adhered to!). SAAs usually mainly include street and property drainage. (Sources: Internal SEW documents, Office for Waste, Water, Energy and Air Canton ZH)

Internal pipe. Internal pipes are distribution lines, i.e. they are the lines within the building or area for which the consumer is responsible.