Hydrologic Change Caused by the Eruption of Mount St. Helens


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



Document Type: Proceeding Paper

Part of: Irrigation and Drainage:

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: Hydrology | Watersheds | Volcanoes | Hydrologic models | Vegetation | Water discharge | Landslides |

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