Maybe because the city underwent a massive transition post Industrial Revolution? "In late January and February 1937, 19 inches (48 cm) of rain fell during a mo

Maybe because the city underwent a massive transition post Industrial Revolution? "In late January and February 1937, 19 inches (48 cm) of rain fell during a month of heavy rain. It caused the "Great Flood of '37".[23][24] The flood submerged about 70% of the city, caused the loss of power, and forced the evacuation of 175,000 residents. It led to dramatic changes in where residents lived." (from http://en.wikipedia.org/wiki/Louisville,_Kentucky http://en.wikipedia.org/wiki/Louisville,_Kentucky)