Drought is called severe when value of Aridity Index (AI) is

Solution (By Examveda Team)

An aridity index is a numerical indicator of the degree of dryness of the climate at a given location. These indicators serve to identify, locate or delimit regions that suffer from a deficit of available water, a condition that can severely affect the effective use of the land.
Drought is called severe when the value of the Aridity Index is 1 to 2.