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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is one of many communities in Calgary that experiences localized flooding during storm season, due in large part to an outdated drainage system.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, we launched the Community Drainage Improvement (CDI) program to study why certain communities experienced flooding issues.

CDI program study findings

The study showed that older communities built with only a single drainage system were more prone to flooding. Before the late 1980's, communities were built with only the underground pipe system which was sufficient for the time they were built.

After the late 1980's, standards changed and communities are now built with a dual-drainage system which consists of an underground pipe system capable of handing a 2-5 year rainfall event and an overland drainage system (like a storm drain) typically able to handle up to a 1-in-100 year rainfall event.

The study recognized that stronger storms and a larger population reduces our storm system's ability to handle heavy rain. Our engineers looked at each community and have come up with unique solutions to improve drainage in each area.

Drainage improvement projects

Below, are the projects planned and going ahead for the Sunnyside community drainage project. Together, these projects will greatly improve drainage in Sunnyside and alleviate flooding and property damage caused by severe rainfall events.

For more details on the engagement process for these projects, visit our engagement page.

Upper Plateau Separation Project
The Upper Plateau Separation project is to help reduce river flood risk complications caused by storm water flow in the communities of Hillhurst/Sunnyside. It will prevent storm water run-off from the upper plateau pumping to the surface in the lower plateau.

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 will continue to pump during events severe enough to flood nearby 3 Street N.W. by over 1.35 metres in depth. The station can continue to pump during events greater than 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 May 2018.

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 (200 Memorial Drive N.W.)
The new Sunnyside lift station will alleviate overland flooding on Memorial Drive, and localized flooding in the south east area of Sunnyside by Memorial Drive and 3 Street N.W. The location of the lift station is 200 Memorial Drive N.W. between the Calgary Curling Club and the CPA parking lot (Lot 59). We are currently gathering information to help with the preliminary design development of the project. The anticipated construction schedule for the proposed lift station is Q4 2018 to Q4 2019.