Residents of the Atlanta area know all too well that heavy rains and hurricanes are a significant threat to the city. The state of Georgia averages 45-75 inches of rain per year, and with over 200 dams, one would think flooding is a serious concern. Flooding in the Atlanta area can be caused by four major factors: flash floods, heavy rainfall, river overflow, and dam or levee failure. Surprisingly, major flooding in Atlanta has not been much of a concern to Atlanta locals. That is until 2009 when heavy rainfall caused flash flooding that caused record-breaking damage.