Therefore, in addition to the flood control benefit provided by water control works, these works also limit the flows on the river to help keep the lower portion of the Assiniboine River in bank and ultimately maintain the river’s present course in a potentially unstable and naturally dynamic reach of the river. [...] The diversion has been successful in preventing flooding along the Assiniboine River on a number of occasions, but the record flood in 2011 exceeded the combined capacity of the river channel and the design capacity of the Portage Diversion. [...] The slope of the river channel within the delta reach to the west is relatively high, so the river water velocities are relatively high and the waters of the river carry significant amounts of sediment. [...] The extent of the alluvial fan along with many of the channels that formed the fan can be seen in Figure 6 above, and the alluvial fan is visible as the brown area north and east of Portage la Prairie in Figure 2. Near the fan apex, the alluvial fan is a broad dome of sediment. [...] Figure 8: Generalized profile of the Assiniboine River to illustrate the topography and the major features, such as the Assiniboine Delta and the alluvial fan that the Assiniboine River crosses between Brandon and Winnipeg.
- Pages
- 123
- Published in
- Ottawa, Ontario
