Future Design Flood Values in the Upper Fraser River Basin Using the CanESM2-LE

Pilot study for the development of stream flow design value projections and a prototype online tool. The BC Ministry of Transportation and Infrastructure supported PCIC in a pilot project to quantify design flood values (2-, 20-, 50-, 100- and 200-year events) for historical and future periods and make them accessible as a gridded product via PCIC’s Climate Explorer tool. As part of this work, PCIC has also been asked to calculate and supply the Melton Ratio as a gridded product. This study focuses on the Upper Fraser, a 34,200 km² region upstream of Prince George, BC, with primarily snow-dominated watersheds. This report was prepared for the Engineering Services Branch of the Engineering Systems Department of the Highway Services Department, Ministry of Transportation and Infrastructure, Government of British Columbia.