Quotes from Geoff Williams

Near the end of the flood, weather forecasters began tallying up just how much rain had fallen in the Dayton area alone. One estimate making the rounds shortly afterward was that during the four days it rained on Dayton, the amount of water dumping over the city and passing through the streets equaled the amount of water that flows over Niagara Falls in a four-day period.

United States Weather Bureau concluded that over 8,000 square miles,* 9 trillion gallons of water fell, weighing 33 billion tons.