on the slopes the volcano, the jökulhlaups are quick to hit the lowlands once floodwater has reached the glacier's surface — in as little as ~5 minutes at peak discharge.
Chapter V. Öræfi district and Markarfljót outwash plain: Rating of flood hazards (pdf 2.35 Mb)
Pages 101–122
Emmanuel Pagneux og Matthew J. Roberts
Short summary
A semi-quantitative, damage-oriented method
/hydrology/hazard-risk-assessments/glacial-outburst-floods/markarfljotsaurar-oraefajokull/