Question

why is there scarcity of water in desert

Answer 1

Economic water scarcity is caused by a lack of investment in infrastructure or technology to draw water from rivers, aquifers or other watersources, or insufficient human capacity to satisfy the demand for water. One quarter ofthe world's population is affected by economicwater scarcity.

Answer 2

 Most of this is rangeland, where annual winter rainfall is less than 200 millimeters, or desert, where it is less than 100 millimeters. Many of the billion people affected by water scarcity live in developing countries.