Worst Case Drought in Illinois

Precipitation Departures for Sites across Illinois Experiencing their Driest a) 1 Year, b) 2 Years, c) 3 Years, d) 5 Years, and e) 10 Years, Expressed as Percent of Normal 1971-2000 Precipitation. Source: The Water Cycle and Water Budgets in Illinois: A Framework for Drought and Water-supply Planning by Derek Winstanley et al., Illinois State Water Survey IEM 2006-02 (pdf).