Flooding
When La Niña does strike, flooding is usual along the Warrego: major floods associated with La Niña events occurred in 1950, 1954 to 1956, 1971, 1973, 1998 and 2008. Oddly, the most destructive flood ever recorded on the river took place in the absence of La Niña. In April 1990, as a result of two extremely strong trough in the easterlies, over 400 millimetres (16 in) of rain (more than the annual rainfall in over 60 percent of years) fell in Cunnamulla in two weeks. The river, along with most tributaries of the Darling, reached near-record levels and the towns of Augathella and Charleville were devastated. At Charleville a river height peak of 8.54 m was recorded.
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