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The diversion of flood water has been criticized for shifting the impact of flooding from urban Winnipeg to rural communities such as Emerson, Morris, St Adolphe. In 1997 these towns and the surrounding farm buildings and lands ended up with the bulk of the flood water in order to save Winnipeg from flood damage. [17]
A map of the FM Area Diversion Project. The Fargo-Moorhead (FM) Area Diversion project, officially known as the Fargo-Moorhead Metropolitan Area Diversion Flood Risk Management Project, is a large, regional flood control infrastructure project on the Red River of the North, which forms the border between North Dakota and Minnesota and flows north to Lake Winnipeg in Manitoba, Canada.
A more obvious man-made disruption of the marsh is the Assiniboine River Floodway, which crosses the marsh near its west end. This floodway diverts Assiniboine River floodwater northwards from just upstream of the town of Portage la Prairie directly into Lake Manitoba, thus protecting the town and the city of Winnipeg from spring flooding ...
This helps prevent flooding on the Assiniboine down river from the diversion, including in Winnipeg, where the Assiniboine River meets the Red River. During flood years such as the 2011 Assiniboine River flood, inlet flows to the Portage Diversion control structure were measured at over 54,000 cu ft/s (1,500 m 3 /s). This amount of water would ...
In Winnipeg, the flood crested at 24.5 feet (7.5 m) above datum at the James Avenue pumping station, making it the third-highest flood at Winnipeg in recorded history. It was surpassed by the floods of 1825, and 1826. The city was largely spared the fate of Grand Forks thanks to the Floodway, which was pushed to its capacity during the 1997 flood.
The flood came close to overcoming Winnipeg's existing flood protection system. [42] At the time, the Winnipeg Floodway was designed to protect against a flow 60,000 cu ft/s (1,700 m 3 /s), but the 1997 flow was 63,000 cu ft/s (1,800 m 3 /s). To compensate, the province broke operational rules for the floodway, as defined in legislation, during ...
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Flooding in Manitoba was not expected until the second week of April. The CPR Line from Winnipeg to Emerson closed. The floodway was opened around 1 p.m. on April 8 due to a crest expected to hit the city of Winnipeg. Highway 75, a major artery between Winnipeg and the U.S. border, was closed between April 7 and May 13.