Drought. Most Australians will be familiar with the concept, some very familiar of late.
Nationwide, 2018 has been the fourth-driest April to June since the Bureau of Meteorology started taking records back in 1900.
In southern Australia, droughts of the late 20th and early 21st centuries have been found to be the worst in the past 400 years, and droughts are expected to become more prevalent in the future.
Types of drought
Not all droughts are created equal. There are four main interconnected types.