Linked from
The 16 pages that link to Sewerage, each with the reason it gives.
SanitationRelated: It is the principal centralized infrastructure for sanitation in many cities.
Sanitary engineeringRelated: Sewers connect homes and businesses to wastewater treatment facilities.
Squat toiletRelated: Many squat toilets discharge into the same sewer systems as seated toilets.
CityRelated: Wastewater networks limit disease and pollution in concentrated settlements.