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Case Study

Stormwater retrofit design and construction

Marshall Springs Stormwater Quality Retrofit

Advisian 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 natural streams in Fish Creek Park.

Client Challenge

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 the 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 Evergreen’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 Marshall Springs and divert flows from Evergreen into it at various locations.  The proposed wet pond system will be designed to handle the 1:5 year, 24 hour City of Calgary storm.    

Our Solution

Our team members provided detailed engineering and environmental design of the stormwater retrofit in Fish Creek Park. The project required tunnelling through the hillside to accommodate a 1650mm diameter diversion pipe to the pond systems which splits flow into two separate cells to take advantage of natural terrain and vegetation. The project included full-time construction supervision to connect the pond system to a proposed wetland south of the project. This project was one of the six sites slated for design and construction under the 2008 retrofit program.

Value Delivered

The complex design included an 8-foot diameter tunnel down the side of the escarpment and the design of a complex energy dissipater. The overall design was integrated with the provincial park and provided amenities for pathway systems and integration of natural springs to eliminate over 90% of the sediment loading that used to enter Fish Creek. 

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