23. Sewer in the News
This scattergraph is a hydraulic mother lode showing three distinct hydraulic events. This flow monitor was installed in a 15-in sewer located just upstream from four consecutive 90-degree turning manholes. The head loss due to this routing causes a capacity loss of 0.5 MGD. A contractor inadvertently left a concrete block in the channel of one of the manholes, resulting in a further capacity loss of 0.7 MGD. A large rain event then occurred, resulting in a surcharge of 75 inches and an SSO upstream from the monitoring location. The SSO entered a small pond and caused a fish kill that made the evening news.
