Civica worked with the City of Guelph to develop a pipe-by-pipe detailed sanitary sewer model for the Clair-Gordon sewershed. The model was calibrated using 2017 flow monitoring data. Hydraulic analysis was completed for three development scenarios. The work included the collection of existing data; analysis of data to establish dry and wet-weather flow peaks, volumes, and patterns; hydrologic and hydraulic modelling utilizing InfoWorks ICM; investigating the capacity of selected outlets under existing, approved, and future conditions; and developing risk management solutions for future conditions. Analysis of the monitored flows provided input to existing development flow generated during large storms while the model predicted the hydraulic performance of the sewer system under these critical flows. A proposed flow control strategy was demonstrated to service the ultimate build-out scenario. In-line flow control was proposed as an interim and ultimate solution to attenuate peak flow in two locations. A conceptual design of the flow control was completed.