* Rainwater: Bhutan receives an average of 1,500 mm of rain per year, which is more than twice the global average. This rainfall is the primary source of water for the country's rivers, lakes, and groundwater aquifers.
* Snowmelt: The Himalayan mountains that border Bhutan are home to some of the world's largest glaciers. As these glaciers melt, they release water into the rivers and lakes below. Snowmelt is a particularly important source of water during the dry season, when rainfall is scarce.
* Springs: There are many springs throughout Bhutan, some of which are considered sacred. These springs are often located in religious sites, and they are used by people for drinking, cooking, and bathing.
* Aquifers: Bhutan's groundwater aquifers store a large amount of water, which is used for irrigation and drinking. The aquifers are recharged by rainfall and snowmelt.
* Water conservation: Bhutan is committed to water conservation, and the government has implemented a number of policies and programs to promote this goal. These include rainwater harvesting, water reuse, and the use of water-efficient appliances.