Hydrologic Change Caused by the Eruption of Mount St. Helens

by William E. Branch, US Army Corps of Engrs, Portland, United States,



Document Type: Proceeding Paper

Part of: Structures for Enhanced Safety and Physical Security

Abstract:

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.

Subject Headings: Watersheds | Volcanoes | Hydrology | Hydrologic models | Water discharge | Vegetation | Runoff | Washington | United States

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