Blog of Bong Seog Jung

The City of Markham’s water distribution system is supplied through the Region of York transmission network with water derived from the City of Toronto and the Region of Peel. Accordingly, the City does not engage in treatment or disinfection operations as raw source water from Lake Ontario is treated by the supplying utilities prior to reaching the City’s system. Moreover, it is understood that the City of Toronto and Peel Region (as well as York Region, where necessary) typically use chloramination for secondary disinfection as it is less volatile (more stable) than chlorination alone, therefore maintaining a long-lasting disinfectant residual. This is particularly important in distribution systems, such as the York Region-Markham system, which may be subject to high water age from long residence times and potentially low turnover via processing through numerous storage facilities. To protect consumers from microbiological risk, the City monitors a wide range of water quality param...

 The Regional Municipality of York (York Region, or Region) supplies water to nine area municipalities, including the City of Markham (Markham)’s and the City of Richmond Hill (RH)’s water systems. In turn, Markham and RH deliver water to individual consumers. Markham’s PD7 water system is supplied by the Region’s system via a single transmission main from Elgin Mills Road East and Highway 404, from hereon referred to as the Elgin Mills watermain. As there is no redundancy to the area, the supply should not be interrupted. Owing to a lack of redundancy and future anticipated growth around 19 th  Avenue and Highway 404, Markham has proposed a short-term solution to loop a 300 mm watermain with RH’s 300 mm watermain across Highway 404 close to Mobius Drive, from hereon referred to as the Mobius Drive watermain. This short-term solution would be in place until a long-term solution is developed, funded, and constructed by the Region. This study is to undertake a hydraulic analys...