This report is further to the feasibility study conducted in 2018 by Alliance Ruelles-Bleues-Vertes (ARBV) and its consultants to assess the project’s potential and feasibility. The feasibility study assessed the impacts and demonstrated the interest in the project. It focused on two alleys in order to accommodate the pilot project, which proposes to disconnect roof drains from municipal networks to redirect the rainwater to green infrastructure located in alleys. One of the two sites selected is the alleyway on the south side of Building 7 in the borough of Pointe-Saint-Charles.
This report presents the 2020 blue-green alley project for the Montreal borough of Pointe-Saint Charles. The project involves disconnecting roof drains from municipal networks in order to redirect rainwater to green infrastructure located in alleyways. This project explores three themes: (1) infrastructure sharing, (2) identification of a cost effectiveness threshold for this type of development; and (3) creation of differentiated incentives to encourage investment by various stakeholder groups. The document promotes innovative models that build on local appropriation (i.e., integrating and taking ownership) of nature-based solutions. It is aimed at finding solutions for the use of rainwater from the roofs of neighbouring buildings, with the objective of retaining and treating runoff on site, demineralization and increasing vegetation cover.