{"id":18754,"date":"2025-11-19T10:35:07","date_gmt":"2025-11-19T15:35:07","guid":{"rendered":"https:\/\/www.obvrdn.ca\/erosion-des-berges\/"},"modified":"2026-04-02T15:10:50","modified_gmt":"2026-04-02T19:10:50","slug":"bank-erosion","status":"publish","type":"page","link":"https:\/\/www.obvrdn.ca\/en\/bank-erosion\/","title":{"rendered":"Bank Erosion"},"content":{"rendered":"

In the Rivi\u00e8re du Nord watershed, bank erosion is of particular concern in urbanized and agricultural areas, as well as where watercourses have been straightened or artificially altered. Weakened riparian buffers and increased runoff accelerate soil loss and sediment transport into watercourses.<\/p>\n

Human activities such as motorized boating, recreational development, and traffic along the banks also worsen bank erosion. These combined factors have a direct impact on water quality, wildlife habitats, infrastructure, and waterfront property values.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

Bank erosion<\/h3><\/h2><\/div>

Data from the iEAU platform reveals a gradual deterioration of water quality from north to south in the Rivi\u00e8re du Nord watershed. Since 2016, monitoring stations have shown a decrease in the bacteriological and physico-chemical quality index (BPQI), reflecting increase concentrations of fecal coliforms, phosphorus, and nitrogen.<\/p>\n

Lakes in the territory are also affected: increased turbidity, the presence of cyanobacteria, and nutrient enrichment indicate accelerated aging of the aquatic ecosystems (eutrophication).<\/p>\n<\/div>

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Did you know?<\/h4><\/div>
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A vegetated riparian buffer of at least 10 to 15 meters can retain up to 80% of the sediment transported by runoff and effectively protect banks.<\/p>\n<\/div><\/div><\/div>

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Location within the territory<\/h3><\/h2><\/div>

Some areas within the watershed are more vulnerable to erosion and soil movement. In the Argenteuil Regional County Municipality, the areas located around the Ruisseau des Vases and the Rivi\u00e8re de l\u2019Ouest, in Brownsburg-Chatham, are particularly affected. Sensitive areas can also be observed along the Rivi\u00e8re du Nord, especially in Lachute, Saint-Andr\u00e9-d\u2019Argenteuil, and in areas where bank slope are steeper or at the confluence of certain tributaries.<\/p>\n

Further north, in the Laurentian Plateau, steep slopes and wooded areas are naturally prone to erosion, a phenomenon exacerbated by human activities and variations in the flow rates of watercourses.<\/p>\n

Consult the interactive portrait and browse through the Physical Characteristics (Caract\u00e9ristiques physiques) tab and, in the Hydrography (Hydrographie) layer, select Landslide and Erosion Events (\u00c9v\u00e8nements de glissement de terrain et d\u2019\u00e9rosion) to view the areas impacted by this problem.<\/p>\n<\/div>

Interactive portrait (in French only)<\/span><\/a><\/div><\/div><\/div><\/div><\/div>

Main causes<\/span><\/span><\/span><\/h3><\/h2><\/div>

Bank erosion is a natural phenomenon amplified by certain human uses. Within the territory of the Integrated Water Management Zone (ZGIE), it is primarily caused by:<\/p>\n<\/div>

Human factors<\/h4>\n<\/div>

<\/i><\/i><\/span>Watercourses modifications<\/span><\/a><\/h4><\/div>
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