COMPARISON OF BANK EROSION AT VEGETATED AND NON‐VEGETATED CHANNEL BENDS1

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Abstract
Following major floods in 1990 which resulted in widespread bank erosion in southern British Columbia, four streams typical of the region were evaluated for the effect which riparian vegetation played in reducing erosion. A total of 748 bends in the four stream reaches were assessed by comparing pre‐ and post‐flood aerial photography. Bends without riparian vegetation were found to be nearly five times as likely as vegetated bends to have undergone detectable erosion during the flood events. Major bank erosion was 30 times more prevalent on non‐vegetated bends as on vegetated bends. The likelihood of erosion on semi‐vegetated bends was between that of the vegetated and non‐vegetated categories of bends.

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