Recent heavy rainfall in the Atlanta metro area has led to a significant fish kill along a 20-mile stretch of the Chattahoochee River. Environmental agencies and the Atlanta Watershed Management Department are investigating the incident, which is believed to have resulted from a combination of factors including drought conditions, stormwater runoff, and sewage overflows. Thousands of fish have been reported dead following the flash flooding, raising concerns among local Riverkeeper organizations. The situation is described as unprecedented, with agencies working to understand the full extent and causes behind the event.