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City of Edmonton staff released neighbourhood flood prediction maps last fall in response to an Edmonton Journal access to information request. They’ve since released the information into an open-data catalogue.

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The information is based off a hypothetical 1-in-100-year storm. Surface ponding areas represent how deep water is expected to pool during a severe rainstorm. The coloured lines represent surcharge depths of city pipes. Red represent pipes at capacity which can backup into manholes, potentially causing basement flooding.

Because they are based on a multi-year study, these maps don’t take into account flood mitigation projects done within the last few years. Also, some neighbourhoods were not studied.