Critical durations of snowmelt periods in the Liard and Hay River floods / by H.A. Thompson and U. Sporns. : En57-56/517-1964E-PDF

"The greatest flood-levels ever recorded at Fort Simpson, NWT occurred in April 1963 during the spring break-up of the Liard River. At approximately the same time the town of Hay River was inundated by flood-waters of the Hay River. In this paper an attempt is made to determine the flood producing meteorological factors. Due to the absence of streamflow and snow course data in these basins it was necessary to limit the investigation to the observed climatological parameters. It is shown by an analysis of snow-depth on ground observations that the rate of depletion of the snow-pack for durations of 20-25 days following the start of the spring thaw is a critical factor in producing floods on these rivers. Very moist antecedent conditions also contributed to the 1963 floods"--Abstract.

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