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Reducing flood damage -
Dykes
Dykes are embankments built to protect low-lying areas from inundation and are the most commonly used structures to protect Canadian communities. They alter only high flows of water by restraining entry to the low-lying areas. The degree of protection provided by dykes depends on their height and construction. High water occurrence increases pressure against the dykes, accelerates their erosion, hastens their saturation and damage due to under-seepage, and may result in overtopping during extreme floods. Any of these incidents can result in dyke failure. The reliability a dyke system offers is contingent upon its continued inspection and maintenance. Dyke construction frequently necessitates the installation of internal drainage and pumping facilities to minimize flooding behind the dyke caused by seepage through the dyke, the interruption of the natural drainage within the protected area, and by the backing up of sewers during high stormwater runoff.
Brewer Park dyke – Ottawa, Ontario
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