Because of the intimate relationship between climate and the hydrologic cycle, changes in the climatic regimes could directly affect the average annual water flow, its annual variability, seasonal distribution, and quality. Greater climatic variability would mean changing the frequency of extreme weather events and increased droughts and floods. Rising seas could mean the drowning of coral reefs, and other coastal ecosystems, such as mangrove swamps and coastal marshes, as well as the intrusion of salt water into our drinking water aquifers. A drought is a sustained and regionally extensive occurrence of appreciably below-average natural water availability, in the form of precipitation, streamflow, or groundwater. Droughts are natural events which have occurred throughout history and may be considered as temporary features caused by fluctuations in the climate.
Flooding is almost always a natural occurrence.
An exception would be flooding due to the collapse of a dam, of which there are very few in Florida. There are many conditions and variables that determine whether a lake or river over tops its banks or an ocean rises along its shores. Heavy rainfall itself can also cause floods. This is frequently the case in Florida where thunder storms are often very intense. Severe storms like hurricanes result in storm surges when sustained high winds from one direction push the water level up over beaches and sea walls.