has part has participant composed primarily of proglacial lake liquid water sediment environmental material water flow process glacial run 2019-07-03T14:50:41Z Glacial runs occur in virtually all glaciated regions of the world and are most commonly directly sourced from any part of a glacier where water can accumulate into a lake. A jökulhlaup usually occurs because a glacial lake drains rapidly due to failure of an ice dam or moraine dam. Jokulhlaup Jokuelhlaup A water flow process which comprises a sudden‐onset high‐magnitude discharge of water and sediment from a glacial source Jökulhlaup subglacial lake