The Unique Rehabilitation of the Aurora Magmeter Bypass Sewer: Richmond Hill, Canada

Owned and managed by the Regional Municipality of York, the Aurora Magnetic-Flow-Meter Bypass (AMB) stands as a subterranean, permanent sanitary bypass sewer situated at the southeastern intersection of Bloomington Road and Yonge Street within the confines of the Town of Richmond Hill. This vital infrastructure facilitates the essential upkeep and maintenance of the Magmeter, as and when needed. Recent assessments of the AMB have revealed a state of deterioration that demands urgent intervention to avert potential failure. In response, a comprehensive rehabilitation plan for the AMB has been conceptualized by Jacobs. This comprehensive plan encompasses the structural lining of a 43-m section of a sanitary sewer with a diameter of 1,050 mm, in addition to the rehabilitation of nine distinctively configured chambers. These chambers connected with the AMB include a pentagonal chamber and an L-shaped chamber. The latter is composed of three individual chambers seamlessly interconnected, yet distinctly separated by flow control components, such as sluice gates and stop logs. The intricate nature of this project is compounded by the presence of compact maintenance openings and the inclusion of a drop structure. The distinctive design of these chambers presented a formidable challenge during both the design and construction phases. Each chamber necessitated a tailor-made solution to address its unique characteristics and requirements. Of particular note is the fact that the existing flow control elements had ceased to perform their intended functions, thereby elevating the project’s complexity. A notable facet of the rehabilitation strategy was its conceptualization to be executed without resorting to the establishment of an above-ground temporary bypass system.