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:
“When raging love with extreme pain
Most cruelly distrains my heart,
When that my tears, as floods of rain,
Bear witness of my woeful smart;
When sighs have wasted so my breath
That I lie at the point of death,”
—Henry Howard, Earl Of Surrey (1517?–1547)
“Let the floods clap their hands; let the hills be joyful together.
Before the Lord; for he cometh to judge the earth; with
righteousness shall he judge the world, and the people with equity.”
—Bible: Hebrew Psalm XCVIII (l. XCVIII, 8–9)
“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)