Advisian team members provided Preliminary and Detailed Design as well as construction support of the large stormwater retrofit complex above which eliminated over 90% of the sediment load from entering the Bow River.
In 2004, the City of Calgary completed a Stormwater Loading Study as well as a Bow River Impact Study. These two studies clearly identified the need to manage the total suspended solids (TSS) and the nutrient loadings in order to protect the Bow River’s aquatic ecosystem. Of the total TSS entering the river systems, stormwater contributes an estimated 90% of the total loading. Prior to 1998, many of Calgary’s communities ,including Evergreen community, drained directly to receiving water bodies without any water quality treatment.
The goal of this project is to divert as much runoff from Deer Run and Deer Ridge’s stormwater pipe system into a system which will reduce flows and provide sediment removal to the runoff before releasing into Fish Creek. To help detain and provide sediment removal of this runoff, it is proposed to create a wet pond system in Burnsmead and divert flows from the communities to the north. The proposed wet pond system will be designed to handle the 1:5 year, 24-hour City of Calgary storm.
Our team provided detailed engineering and environmental design of the stormwater retrofit in Fish Creek Park including the removal of outfall B126 on the Bow River and the reestablishment of a backwater oxbow. The project also included full-time construction monitoring. This project was one of the six sites slated for design and construction under the 2008 retrofit program. The detail design of this project was completed in 2009 with construction in 2010.
The complex design included diversion and reclamation of a 1800 mm diameter storm sewer which provided the city with considerable savings. A custom designed energy dissipater and forebay provided initial sediment removal with a subsequent wetland and fen providing additional water quality improvement. The design also reactivated an old oxbow within the Bow River and provided additional fish habitat.