There will be Negative Effects to the Environment

Thousands of trees and shrubs will be bulldozed and won’t be replanted on the berm.

The Bow River is an integral part of the Bowness Community and the residents value its natural beauty. The river valley is a place for Bownesians to connect with nature.

In the spring of 2017, Calgary City council approved The Flood Mitigation Measures Assessment Report that includes the construction of berm in four Bow River communities, including Bowness. The City’s conceptual plan was for an overland berm in Bowness extending between the CP rail tracks and Shouldice Bridge, for 3-4km, as shown in the map that appears in a City of Calgary Brochure (December 2017).

The average height of the proposed berm is approximately 1 metre (3.6 feet) but may be as high as 2.0 metres (6.5 feet) on some properties. According to the City, the berm could be some combination of earthen berm and wall and the width of the berm could be as wide as 30 feet to accommodate vehicles access along the berm.

So just how much vegetation will be bulldozed to make way for the berm? BRFM conducted a tree census to answer that question. We counted, measured and mapped more than 5700 trees and shrubs(1) that stand in the way of the proposed berm alignment.

The proposed berm requires removal of the trees and vegetation that naturally provides some flood protection and the city will not allow replacement of lost trees on or near the berm because the roots may jeopardize the integrity of the structure.

Government of Alberta Environment experts recognize many of the species identified in the census (e.g. willows, swamp birch, Saskatoon berry, choke cherry, rose, wolf willow, honeysuckle, etc.) as “very important” or “moderately important” to wildlife (Guide to the Common Native Trees and Shrubs of Alberta, By Wayne Inkpen and Rob Van Eyk). This urban forest provides shelter and food to the wildlife that live here.

Even the city of Calgary Parks & Recreation has posted interpretive signs in Bowmont Park (across the river from the proposed project) that speak to the importance of our urban forests. One of these signs states:

What are some of the other benefits of maintaining a healthy urban forest?

  • Trees help to slow the flow of the river during high water events, thereby reducing flood (a threat for people and buildings). During the 2013 flood, riverside residents witnessed first hand this benefit.
  • Plant roots filter rain and melting snow before is migrates to the river, thereby improving water quality.
  • Trees provide shade for fish and people.
  • Trees are a natural sequester systems by by absorbing CO2.

Map from City of Calgary brochure (December 2017)

Bragg Creek Barrier construction (2021)

BRFM measuring trees as part of the tree census

Mature poplars along the proposed Bowness berm alignment

Visit BRFM’s wildlife inventory to see images of the wildlife sited in Bowness along the banks of the Bow River.

A family of foxes play in a yard along the Bow River

A family of foxes play in a yard along the Bow River

(1) The loss could be greater due to root disturbance during construction.