Hydrometeorology

The Brahmaputra valley predominantly receives southwest tropical monsoons during April through October and occasional winter showers. The monsoon rains account for 90% of the annual rainfall with an average between 2500 and 3200 mm The extremely dynamic regime coupled with the unique physiographic setting of the Brahmaputra basin with its orographic position in the upper catchment areas contributes to frequent flooding in the valley. This chapter provides a short discussion of hydrometeorological aspects of the basin.