A sanitary sewer (also called a foul sewer) is a separate underground carriage system specifically for transporting sewage from houses and commercial buildings to treatment or disposal. Sanitary sewers serving industrial areas also carry industrial wastewater. The 'system of sewers' is called sewerage.
Sanitary sewers are operated separately and independently of storm drains, which carry the runoff of rain and other water which wash into city streets. Sewers carrying both sewage and stormwater together are called combined sewers.
Read more about Sanitary Sewer: Nomenclature, History, Maintenance, Simplified Sewers
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“If men could menstruate ... clearly, menstruation would become an enviable, boast-worthy, masculine event: Men would brag about how long and how much.... Sanitary supplies would be federally funded and free. Of course, some men would still pay for the prestige of such commercial brands as Paul Newman Tampons, Muhammed Ali’s Rope-a-Dope Pads, John Wayne Maxi Pads, and Joe Namath Jock Shields—”For Those Light Bachelor Days.””
—Gloria Steinem (b. 1934)