Figure 3. General evolution of a glacial lake in time. Change of lake volume, susceptibility to outburst flood caused by ice avalanche or calving processes, hazard, and glacier extent in the catchment are shown. Three phases are distinguished: Phase I—proglacial phase (direct contact with the glacier); Phase II—glacier-detached phase (no direct contact, some glaciers in the catchment); and Phase III—nonglacial (no glaciers in the catchment). Decrease in lake volume in Phases II and III represent lake infill by sediment, leading to lake extinction at the end of Phase III. Nonzero susceptibility to outburst flood in Phase III reflects triggers not related to presence of glaciers, e.g., slope movements from slopes with degraded permafrost. Modified from Emmer et al. (2015a).