Nepal is one of the countries with the richest water supplies. The monsoon season (4 months, from June to September) and the Mediterranean winter rains provide a sufficient amount of water. Geological conditions and vegetation help to store the water, so most of the hills have got natural water sources. Only in May and June, the hottest months of the year, is there little water.
The main problem is that drinking water does not reach the population, as most of the sources are too far away from the villages.