Author(s): G. G. Tomasson; S. M. Gardarsson; Th. S. Leifsson; B. Stefansson

Linked Author(s): Thorbergur Leifsson

Keywords: No Keywords

Abstract: The Halslon reservoir is the main water storage for the Karahnjukar hydroelectric powerplant in eastern Iceland. Of the 1800 km2reservoir drainage basin, 1400 km2are covered by glacier, making discharge and consequently floods into the reservoir dominated by characteristics of the glacial discharge. The paper discusses the flood design criteria applied for the reservoir. Three flood events were identified; a design flood corresponding to a glacial melt event, a safety check flood (probable maximum flood (PMF)) corresponding to a probable maximum precipitation, and a catastrophic flood corresponding to a volcanic eruption under the glacier within the drainage basin. Hydraulic structures designed to pass the floods through the reservoir are described briefly, a spillway at the Karahnjukar dam, designed to pass the design flood and the PMF flood, and a fuse plug at the Desjararstifla dam, designed to erode and pass the catastrophic flood.

DOI:

Year: 2009