Discharge
With an average flow at the mouth of about 3,475 cubic metres per second (122,700 cu ft/s), the Fraser is the largest river by volume flowing into the Pacific seaboard of Canada and the fifth largest in the country. The average flow is highly seasonal; summer discharge rates can be ten times larger than the flow during the winter.
The Fraser's highest recorded flow, in June 1894, is estimated to have been 17,000 cubic metres per second (600,000 cu ft/s) at Hope. It was calculated using high water marks near the hydrometric station at Hope and various statistical methods. In 1948 the Fraser River Board adopted the estimate for the 1894 flood. It remains the value specified by regulatory agencies for all flood control work on the river. Further studies and hydraulic models have estimated the maximum discharge of the Fraser River, at Hope during the 1894 flood, as within a range of about 16,000 to 18,000 cubic metres per second (570,000 to 640,000 cu ft/s).
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