Floods
Typically a 1.5 m (5 ft) flood occurs every three years, a 4 m (13 ft) flood every decade, and a fill or near fill a few times a century. The water in the lake soon evaporates with a minor or medium flood drying by the end of the following summer.
In strong La Niña years the lake can fill. Since 1885 this has occurred in 1886–1887, 1889–1890, 1916–1917, 1950, 1955, and 1974–1976, with the highest flood of 6 m (20 ft) in 1974. Local rain can also fill Lake Eyre to 3–4 m (10–13 ft) as occurred in 1984 and 1989. Torrential rain in January 2007 took about six weeks to reach the lake but put only a small amount of water into it.
When recently flooded the lake is almost fresh and native fresh water fish, including bony bream (Nematolosa erebi), the Lake Eyre Basin sub-species of golden perch (Macquaria ambigua) and various small hardyhead species (Craterocephalus spp.) can survive in it. The salinity increases as the 450 mm (18 in) salt crust dissolves over a period of six months resulting in a massive fish kill. When over 4 m (13 ft) deep the lake is no more salty than the sea, but salinity increases as the water evaporates, with saturation occurring at about a 500 mm (20 in) depth. The Lake takes on a pink hue when saturated due to the presence of beta-carotene pigment caused by the algae Dunaliella salina.
Read more about this topic: Lake Eyre
Famous quotes containing the word floods:
“the cold eternal shores
That look sheer down
To the dark tideless floods of Nothingness
Where all who know may drown.”
—Edwin Arlington Robinson (1869–1935)
“In early times, before the floods swept across the world, there was life, albeit odd, as one can see from the fossils of mammoth bones, and there was the regime of Prince Metternich.”
—Franz Grillparzer (1791–1872)
“But it is fit that the Past should be dark; though the darkness is not so much a quality of the past as of tradition. It is not a distance of time, but a distance of relation, which makes thus dusky its memorials. What is near to the heart of this generation is fair and bright still. Greece lies outspread fair and sunshiny in floods of light, for there is the sun and daylight in her literature and art. Homer does not allow us to forget that the sun shone,—nor Phidias, nor the Parthenon.”
—Henry David Thoreau (1817–1862)