Flood risk analysis of Chilliwack, B.C., Canada
In November 2021, a large flooding event happened alongside the Fraser River in lower-mainland B.C. and lasted for several weeks. The city of Chilliwack was among the most devasted cities. That being the inspiration, I designed an MCE research framework to assess flood risks in Chilliwack in B.C. and categorizes areas of the city into three different risk levels by using an MCE analysis in Esri ArcGIS. The MCE method has been combined with analytical hierarchy process (AHP) and weighted linear combination (WLC) technique to obtain the flood risk levels.
The work incorporates five different criteria: land use, slope, elevation, proximity to water and drainage density. The weight for each criterion is calculated through the analytical hierarchy process (AHP) method based on their impacts and importance on flooding events (Table 1). The value of 1 is considered as equally important, and 9 is considered as strongly important. For example, comparing “proximity to waterbody” with “land use”, “land use” is a slightly more important factor to flood propagation. As such, a value of 5 will be assigned to “land use” relative to “proximity to waterbody”.
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