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Sunnyside Community Drainage Improvement Projects

Sunnyside is one of many communities in Calgary that experiences localized flooding during storm season, due in large part to an outdated drainage system.

In 2010, The City launched the Community Drainage Improvement (CDI) program to study why certain communities experienced flooding issues. The study showed that older communities built with only a single drainage system were more prone to flooding. In the late 1980's, standards changed and communities were built with a dual drainage system - an underground pipe system usually capable of handling a 2-5 year rainfall event and an overland drainage system typically able to handle up to a 1-in-100 year rainfall event. Before that, communities were built with only the underground pipe system, which was sufficient for the time they were built.

Recognizing that stronger storms and an increasing population is reducing the storm system's capability to handle heavy rain, engineers looked at each community to determine unique solutions to improve the drainage in that area. Here are the projects planned and going ahead for the Sunnyside community drainage project.

14 Street N.W. Alleyway Drainage Improvement Project: This project will have the installation of a back flow preventer, new manholes, and replacement of 255 metres of existing storm sewer pipe with a new larger pipe. Altogether these retrofits will alleviate flooding issues and property damage caused by severe rain events. This project will be completed in the summer of 2017.

Sunnyside Sanitary Lift Station Replacement (725 3 Street N.W.): The City is replacing the original lift station that was built in 1958 with a more resilient structure that can operate in a 1-in-25 year flood event, and can resume service quickly after up to a 1-in-100 year flood event. The new lift station should be in operation by November 2019.

Sunnyside Storm Lift Station Improvement (605 1 Avenue N.W.): This project will upgrade the existing storm lift station in three stages. First, we will modify existing mechanical pipe, and install a new storm water drainage pipe. This phase of the project started in May 2017 and will be completed by the end of July. In fall 2017, the next step will be to install a liner in the existing pipe to ensure that it is watertight. During the third stage, the existing lift station will be renovated to add more pumps and place critical infrastructure above the 1-in-100 year flood level. Construction is expected to start in spring 2018 with completion in fall 2019.

New Sunnyside Storm Lift Station: The proposed new Sunnyside lift station will alleviate overland flooding on Memorial Drive, and localized​ flooding specifically in the south east area of Sunnyside by Memorial Drive and 3 Street N.W. We are currently gathering information to help determine the location and conceptual design development of the project. We will share more information on the project as it becomes available. The anticipated construction schedule for the proposed lift station is Q3 2018 to Q3 2019.

Together, these projects will greatly improve drainage in Sunnyside and alleviate flooding and property damage caused by severe rainfall events.​​