ABSTRACT

Flood of October 1986 at Seward, Alaska   [open pdf - 8MB]

From the Abstract: "Broad areas along the lower Resurrection River and Salmon Creek as veil as the surfaces of several adjacent alluvial fans in the Seward area were flooded as a result of the intensive rainstorm of October 9-11, 1986. Severe erosion took place through the steep gradient, mountain canyons and near the apex of the fans, while rock and debris were deposited on the distal parts of the fans. In Godwin, Lost, Box Canyon, Japanese, and Spruce Creek basins, and perhaps others, landslides or debris avalanches dammed the streams temporarily. Subsequent failure or overtopping of these dams led to 'surge-release' flooding; peak discharge of such a flood at Spruce Creek was 13,600 cubic feet per second, four times as great as any previously known maximum discharge from the basin and 2.5 times as great as the runoff rate upstream from the debris dam."

Report Number:
Water-Resources Investigations Report 87-4278
Author:
Publisher:
Date:
1988
Copyright:
Public Domain
Retrieved From:
U.S. Geological Survey: https://www.usgs.gov/
Format:
pdf
Media Type:
application/pdf
URL:
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