In June 2017, FEMA issued its preliminary flood insurance rate maps for the City of Minot and Ward County. The preliminary flood insurance rate maps identified 10,000 cubic feet per second as the 100-year flood level, which is twice the flow that had previously been considered a 100-year flood event. The City’s appeal is based off revised hydrology and hydraulics, and argues that the drawdown of Canadian dams and historical Souris River management would result in a 100-year event that would not be greater than 8,000 cubic feet per second, rather than FEMA’s proposed 10,000 cubic feet per second.
The full text of the letter is available here.