What Are the First Signs of a Sink Hole?

Although sinkholes can appear anywhere, the University of Florida IFAS Extension reports that the state of Florida has more sinkholes than any other state in the United States. Even though some sinkholes may appear suddenly, there are some indications that a sinkhole may be forming. Read on for the first signs.

Formation

• Areas with limestone, dolomite or marble beneath the surface are susceptible to sinkholes. Acid from rainfall becomes absorbed into the soil and eats away at these deposits. As layers of rock disappear, holes form and the upper soil sinks in to fill the void---eventually causing ground surfaces to collapse.

Man-made

• According to the University of Florida and FEMA, an increasing amount of sinkholes is a result of construction and city expansion. Disrupting the ground for building purposes and laying pipes will change the natural water drainage pattern underground, shift the soil and add weight to the surface.

Outdoors

• Look for slumping or tilting fences, trees or other structures. Many Florida ponds and lakes were formed from sinkholes. A newly formed pond or water hole after a rainfall and circular areas of wilted plants are sinkhole indicators.

Homes

• Look for discolored or muddy well water and cracks along walls, floors, basements and brick mortar, as well as across lawns. Built-on areas---such as porches---may show signs of pulling away from the house. Doors or windows may not function properly.

Public Areas

• Look for cracked curbs, sidewalks, parking lots and roadways. Sinkholes often first appear as minor depressions in the ground where water frequently drains. Watch for sinkholes around water-main breaks or sewer leakages.