Sanitary sewer
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A sanitary sewer is an underground pipe or tunnel system for transporting sewage from houses and commercial buildings to a sewage treatment plant or disposal.
PVC sanitary sewer installation. Sanitary sewers are sized to carry the amount of sewage generated by the collection area. Sanitary sewers are much smaller than combined sewers designed to also carry surface runoff.
Manhole access to sewer
Schematic of a conventional sanitary sewer to convey blackwater and greywater from households to a centralized sewage treatment facility.
A manhole cover for a sanitary sewer access point.
Storm drain
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A storm drain, storm sewer, surface water drain/sewer, or stormwater drain is infrastructure designed to drain excess rain and ground water from impervious surfaces such as paved streets, car parks, parking lots, footpaths, sidewalks, and roofs. Storm drains vary in design from small residential dry wells to large municipal systems.
Storm drain with its pipe visible beneath it due to construction work
American-style curbside storm drain receiving urban runoff
Full view of a storm drain (Ontario, Canada)