Water storage is and will be a key strategy for climate change adaptation. One of the major impacts of climate change in the mountains will be on the availability of water. This, together with increased demand from a growing population for water for agricultural, industrial and domestic purposes, is likely to turn water into a major issue in the countries of Asia in the coming years. One way to address the growing gap between demand and availability of water seems clear: store more water when it is available in excess and release it when it is needed. The more water stored at high altitude the better: a major advantage the Himalayan countries have.