blog posts Water Survey simulation matches progress of Gibson City flood Aug 24, 2021 2:45 pm by Illinois State Water Survey staffWater Survey Share on Facebook Tweet Email This model simulation produced by the Illinois State Water Survey shows the progression of the flood in Gibson City from the morning to the evening of Aug. 12, 2021. Images A model simulation produced by the Illinois State Water Survey shows the progression of the flood in Gibson City from the morning to the evening of Aug. 12, 2021 Share on Facebook Tweet Email