How does the pond work?
During normal operation, water in Tweddle Place stormwater pipes flow downstream into the Mill Woods Double Barrel pipe system and the pond will remain dry. During large storms, pipes in the community and downstream sewers can fill up. When the pipe system is full, water will back up into the Tweddle Place dry pond. In addition, the dry pond will collect surface stormwater directed overland into the pond. The dry pond will store any collected stormwater until capacity is available in the downstream system. When capacity becomes available, the stormwater will drain through catch basins in the bottom of the dry pond into the pipe system. As the name indicates, the dry pond will be dry the vast majority of the time.
Why does the berm have to be removed?
The berm is being removed to enable expansion of the dry pond. Additional stormwater storage volume is required to hold the flows that will be directed to the pond. In addition, removal of the berm ensures that low areas in the community have an unrestricted flow path into the dry pond across the drainage swales that are being constructed.
Why do the trees have to be removed?
Regretfully, trees along the berm have to be removed to allow the berm to be removed. Trees that would be impacted by construction activities will also be removed, This area will be re-landscaped at the end of the dry pond expansion with a mix of native grasses and vegetation, trees and shrubs. Seating areas will also be incorporated into the expanded dry pond, and the existing shared use path will be relocated further east in the pond area. Access to the shared use path will be maintained with openings along the future sound barrier, a living wall.
What is a living wall?
living wall is a visual and sound barrier that incorporates plant material to form a hedge-like, more natural alternative to traditional sound barriers. It replaces the sound and visual barrier functions of the existing earth berm. A demonstration project of the living wall was built in late 2014 near the Mill Woods Christian School along 91 Street.
The living wall demonstration project seems to be struggling. Why is this, and what is being done to ensure it grows?
The living wall demonstration project was constructed in fall 2014. The intention of the demonstration project was to allow the community to experience this type of wall and to confirm its ability to grow in Edmonton’s climate. In a survey, the majority of people who experienced the wall indicated they were supportive of making it a permanent replacement for the berm. Testing proved it was effective as a noise barrier.
For the demonstration, a temporary water supply was installed to help the wall get established. In the establishment phase of the wall, it is critical for the vegetation of the wall to be well irrigated. In the spring of 2015, someone had shut off the water supply, depriving the wall of water during a hot, dry spring. This resulted in the death of many of the willow stalks. While some additional willow stalks were planted to compensate for these deaths on the community side of the wall, a large number of willows were not replaced.
During the dry pond expansion, this section of the wall will be augmented with additional plants. In addition, the full installation will include a piped source of water for the wall. To ensure proper establishment, the contractor will be required to maintain the wall for an extended period.
Will the living wall prevent noise from Whitemud drive and 91 street?
The living wall is a sound barrier, and the effectiveness of its design has been proven with noise monitoring and modelling according to engineering best practices. The wall contains a soil core that is a barrier to sound and functions year round. It also provides other environmental benefits such as cleaning the air, promoting biodiversity and providing wildlife habitat.
What if the construction damages my property?
Occasionally, damage to property or persons may be caused by construction activities. If you believe that you have sustained damage caused by EPCOR or its contractors, you can submit a claim to our adjuster who will investigate and make a recommendation to EPCOR regarding its liability.
What should I do if service is lost during construction?
If you experience an unplanned loss of service related to: