Indus River Basin Rainfall in Average Year

Discharge is highest in May to September which is the wet season at the head waters of the river. Both rainfall and snowmelt contribute to the volume of water carried in the river. During the rest of the year run off is low as there is minimal input from rainfall. However in recent years flow in the river has been changed by the construction of dams and reservoirs.

Rainfall is very low and melt water from the mountains is key to maintaining flow in the river. The subtropical arid zone through which the river flows predominantly receives rain during the monsoon season of July to September. Outside of this period very little rain falls and during the winter months drying winds from the North West cross the plains. Consequently the lower Indus River has a slow sluggish flow as water is lost via evaporation and water abstraction for irrigation and drinking water. Eighty percent of Pakistan’s agriculture relies on the Indus River for water.

Average Total Rainfall (mm/yr)

Bargraph referencing the colours on the rainfall maps.

Other Indus Maps

Indus Rainfall Maps