It mostly occurs in Australia due to salty rivers or salty water
when someone noticed it
Droughts can, and do, occur during any time of the year in Australia.
Australia
Check the meaning of Salinity- I think you have the wrong word. Salinity means how much salt. Senility- is were you get old and your brain functions do not work as they should. It can happen as early as 50 or as late as 80 most common in the late 70's.
Both the Murray and the Darling Rivers of Australia suffer rising salinity problems.
Variations in salinity occur due to factors such as evaporation, precipitation, ice formation, and freshwater input from rivers or melting glaciers. These processes can alter the balance of salts in the water, leading to changes in salinity levels.
Salinity is at its worst in the far west of New South Wales, particularly along some reaches of the Darling River. There are also increasing problems with rising salinity levels around Dubbo and Wagga Wagga. See the related link for a map.
Armadillos are strictly animals of the Americas and do not occur in Australia.
The salinity of Lake Eyre is increasing, and has changed dramatically over time. It was sampled in July 1974, and the minimum salinity value at that time was determined as 7%, and again in April 1975, when the salinity level was determined to be 40%. However, the percentage of salinity also seems to be seasonal. AsLake Eyre is currently full (May 2009), salinity levels are lower than they were prior to the wet season - but this is not always the case. When the floodwaters come from monsoonal rains in north Queensland, salinity levels are initially lower, but the problem is that, with the water flow, more saline is discharged from the Murray-Darling basin groundwaters, thereby oncreasing the salt content of Lake Eyre and the other salt lakes of inland Australia.
Australia (Western Australia and Queensland)
Droughts can occur in all states of Australia.