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This paper presents the results of a systematic qualitative Cost-Benefit Analysis of embankment construction in the lower Bagmati River basin in Nepal and India. Using a unique Shared Learning Dialogue (SLD)-based qualitative cost-benefit that also begins to quantify impacts, it provides insights into the trade-offs among strategies that are similar to, but more transparent than, those used in a full cost-benefit analysis.
This study, prepared in close cooperation with and supported by the United Nations Environment Programme Regional Office for Asia and the Pacific, investigates the impact of climate change on glaciers and glacial lakes in two major glacial hotspots in the Himalayas: the Dudh Koshi sub-basin in the Khumbu-Everest region in Nepal, and the Pho Chu sub-basin in Bhutan.
Affected by Global Warming in the Mountains of the Himalayan Region one of the major objectives of the study was to identify areas where GLOF events had occurred and lakes that could pose a potential threat of GLOF in the near future. Out of a surprisingly large total of 354 glacial lakes, the researchers found 19 lakes that are potentially dangerous in the Poiqu basin and (Tama Koshi) in China.
Severe floods caused by glacier outburst have been frequent in the Nepal Himalayas, occurring more than every three years over the approximately thirty years since the 1960s. Nine potentially dangerous glaciers were identified from flight observations which were carried out in the Eastern and Central Nepal Himalayas on pre- and post-monsoon seasons in 1991.
