In total, ICIMOD*** catalogues 194 glaciers and 377 lakes in the Khumbu region. Since 1970, 13 G.l.O.Fs have occurred. GDH's action is focused on some of the numerous lakes which have been catalogued as having a high risk of rupture. 


(***ICIMOD: International Center for Integrated MOuntain Development)


Since 2007 (4th IPCC report on climate change), the consequences of global warming on high altitude mountain ranges have been observed and are followed by scientific studies. The rapid melting of glaciers leads to the formation of an increased number of glacial lakes. The natural dams, made up of moraine of of ice threaten to collapse. This rupture is known as a Glacial Lake outburst Flood (G.L.O.F.) and can be devastating for the valleys downstream of the lake. Millions of cubic meters of water are poured in a few hours. The resulting debris flows destroy villages, crops and infrastructure over tens of kilometers. 


The aim of the studies that GDH  undertakes is to mitigate the G.LO.F. risk  with little technical risks but with the contribution of the population of the high altitude valleys.


Following a first study using the available data on two G.LO.F.S, the Dig Tsho in 1985 and the Sabai Tsho in 1998, GDH carried out a field investigation during autumn 2013 to carry out and in depth study of the Thulagi Lake: topographic survey, geophysical prospection, grain-sinze analysis, bathymetric study... The report was given out in 2014.