Floatables Control Structure for CSO Outfall 009-010

The original design required bypass pumping of all flow around the location of the floatables control and diversion structure. In order to decrease construction costs and provide for a more reliable bypass system, Wilhelm worked with American Structurepoint to develop an alternative bypass system that would allow gravity bypass of all flows up to a maximum of 121 MGD during the construction phase. Following analysis of several options, the selected option included the installation of a temporary seven-foot-wide by eight-foot-tall cast-in-place box conduit. In addition to assisting Wilhelm with evaluating each potential bypass option, we also provided hydraulic and dynamic load calculations, structural design, and development of plans and specifications.