This case study addresses the climate impacts risks and vulnerabilities related to extreme precipitation events. In the last decade, the City of Hamilton has experienced many unprecedented heavy rainstorms, such as events in 2009 and 2013, causing devastating damages to both private properties and public infrastructure as a result of flooding. As such, it is critical for the City to implement a diverse set of stormwater management strategies, including Low Impact Development (LID). Currently, the City of Hamilton is working on implementing their North End Traffic Management Plan, the purpose of which is to resolve neighbourhood traffic and transportation problems through the application of traffic improvement measures, including the installation of temporary traffic calming measures. This provided an excellent opportunity for the City to include a rain garden at a new road bumpout site in order to pilot the use and implementation of LID. Ultimately, the City hopes to make LID a standard practice in their suite of stormwater infrastructure solutions through pilot implementation.
In response to the City of Hamilton’s increasing challenges with heavy rainstorms, this case study reviews Hamilton’s low impact development (LID) bumpout project, which began in 2018 and involved the design and construction of a rain garden at a pilot bumpout site at the intersection of Bay Street North and Simcoe Street in the City of Hamilton. Partnerships involved in the project, aside from the extensive coordination needed among many internal departments, included Aquafor Beech Ltd., IBI Group, and Rankin Construction. The purpose of the LID project was to control stormwater runoff and improve infiltration on site. Overall, the project aims to improve stormwater management within the road right-of-way; increase pollutant removal through proper drainage and stormwater treatment; reduce pollutant loading to the Hamilton Harbour; improve water conveyance and eliminate standing water at road right of way; improve the overall aesthetic appearance of streets; and, address resident concerns regarding drainage difficulties.