Hydrologic Change Caused by the Eruption of Mount St. Helensby William E. Branch, US Army Corps of Engrs, Portland, United States,
Document Type: Proceeding Paper
Part of: Irrigation and Drainage
On 18 May 1980, the eruption of Mount St. Helens created a massive landslide which covered 32 square miles and stripped all vegetation from 150 square miles. A study of changes in hydrologic characteristics of the Toutle watershed show a dramatic decrease in time of concentration and an increase in the peak discharge frequency relationship.
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