Moist climate dictates karst topography, especially, with limestone as the basement rock.

Limestone mining can pollute water and create sinkholes. When limestone dissolves while it's still in the ground, caves and gullies form, a natural phenomenon known as karst (click here). Although this doesn't hurt the environment in its natural form, once the limestone is mined out, sinkholes can form and disrupt underground waterways. This changes the natural water table. The actual mining process also changes existing waterways, adding additional water to streams and other bodies of water that not only floods the surrounding area, but adds pollutants to it as well. At the same time, it draws water from other features such as lakes and ponds.

Limestone can be damaged by the environment through weather and water erosion. The stone absorbs water that can cause it to deteriorate over time. If the water has a high acidity content, the damage is more immediate. Wind can wear away stone detailing. Limestone is also prone to discoloration by exposure to oil, dyes or even organic material, such as bird droppings or decomposing plant matter. It can even get rust stains if exposed to oxidizing iron.

Contractors drained the swamps and built retirement communities. What were they thinking? The government states, "...sink hole deaths are rare." SO! Therefore, what?

August 19, 2015
By Jason Silverstein

The hell hole has come back. (click here)
A sinkhole in Florida that fatally swallowed a man two years ago has now reopened, police said Wednesday morning.
The second-time sinkhole in Seffner is 17 feet wide and 20 feet deep, Hillsborough County Fire Rescue spokesman Ronnie Rivera told the Daily News. It has not swallowed anything or anyone, he said.
“We’re not expecting it to get bigger,” Rivera said. “It has not spread. It just opened again.”...