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Nature-Action Québec Inc. Quebec City, Quebec

Development of an intervention plan in the Rivière à la Raquette watershed.


Field visit observations and cartographic data suggest that the Rivière à la Raquette is not in a state of equilibrium. Specifically, it shows serious erosion and slippage, a lack of vegetation, an absence of medium-size wetlands, and very steep riparian strip embankments. All these factors indicate that the river’s reduced mobility space accelerates the flow of water, which increases flooding problems for inhabitants along the Ottawa River. 

Through a hydrogeomorphological analysis, three priority sub-watersheds were determined, and an intervention plan started for each prioritized area. Several potential solutions were identified to improve bank stability, provide watercourse mobility space, slow water flow, as well as filter runoff water and improve water quality throughout the hydrographic network. 

Possible solutions include:
  • Bank stabilization and revegetation
  • Re-meandering and reconnection with hydraulic annexes
  • Sediment recharge
  • Freedom space
  • Hydro-agricultural structures

The proposed solutions will prevent yield losses for farmers and improve ecosystem health. Healthy ecosystems provide many ecosystem services that improve human quality of life. Furthermore, these solutions will enable the water system to return to a dynamic equilibrium more quickly. In the long term, the aim is to reduce water flow velocity and bank erosion. This will ensure the safety of goods and services by reducing the risk of flooding. 

These intervention plans are the first step in a long process of improving the current state of the watershed. The next steps are to continue studying the territory, consulting with experts, consulting with owners, implementing improvements and monitoring the expected benefits.

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