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How often do you think about the sewers beneath your feet? Wastewater professionals think about them for a living, but most people never think about them at all. However, a community and its sewers are inextricably linked, and as a result, the flow of wastewater in the sewers below provides some remarkable insights into the life of the community above, and thus the connection between sewers and sociology. This webinar provides a tour of the City of Las Vegas and its surrounding metropolitan area through the eyes of a sewer, as revealed through hydrographs of sewer flow data. This webinar is not a typical technical presentation, but rather a collection of interesting observations of human behavior documented by sewer flow monitors located throughout the Las Vegas area. An overview of sewer use patterns is provided for normal weekday and weekend periods. Variations are then discussed based on land use differences. Other distractions and disruptions that depart from normal diurnal patterns are also presented – including holidays, a power outage, concerts (including Taylor Swift), and sporting events (including Super Bowl LVIII). Practical applications include sewer design, infiltration and inflow evaluation, hydraulic modeling, and real-time alarming.