Kennedale End-of-Pipe Constructed Wetland Project
This $7.5 million Kennedale Wetland is Edmonton’s first end-of-pipe treatment wetland and is a cornerstone project of Stormwater Quality Strategy. It is designed to treat about 70% of the flow from Kennedale Storm Basin, which covers 7,250 ha surface area, to reduce 44% of suspended solids before entering into the North Saskatchewan River (NSR).
The Federation of Canadian Municipalities awarded the City of Edmonton the FCM Sustainable Community Award in the Water category for this Kennedale Wetland project.
Components of the Wetland
- Two 3m diameter and 9m deep Stormwater Treatment System (STS) units
- One new concrete weir inside the existing 3.6m diameter tunnel
- One flow control chamber
- One diversion chamber
- One discharge control chamber
- One forebay for inlet
- Two deep pools
- One micropool for outlet
- Six sluice gates (3 with electrical controls, automation and programming connection into the City’s existing monitoring system
How the Facility works
- The stormwater flow (up to 0.5 m3/s) from Kennedale Storm Basin is diverted into the Wetland through a diversion pipe.
- The suspended sediment particles will be settled in the forebay, absorbed by plants, consumed by bacteria, and other means.
- The flows higher than 0.5 m3/s will then be diverted into two parallel Stormwater Treatment System (STS) units to separate the sediments and floatable from the main flow.
- The treated stormwater is discharged to the NSR through the existing Kennedale Outfall.
- During high flow seasons, flows higher than 2.1 m3/s will bypass the diversion structure and discharge to NSR.
Water quality is monitored continuously by collecting water samples from:
- the micropool (outlet) weekly in the normal condition
- upstream (before water enters the facility) and downstream (when water is discharged from the outlet) during wet weather conditions
- the STS units during wet weather conditions
Drainage Services also monitors water quality in other locations such as lakes, outfalls, creeks and intakes.
- Improves water quality discharged into the NSR collected from the Kennedale Storm Basin
- Improves local air quality by providing a place to hold carbon and reduce heat island effect generated from urban lands
- Duplicates the functions of a natural wetland by providing additional local biodiversity areas and creating natural habitat for flora, fauna, and avian species within an urban setting
- Provides enhanced green space for recreation
- Helps to build public awareness of the importance and benefits of retaining existing wetlands in future urban development areas
- Serves as an educational tool to demonstrate the functions of wetlands and their importance in the environment