How to Detect Sink Holes

Examine the affected property. Look for unevenness or cracks forming in foundations or paved surfaces. Look for landscaping features that seem to be tilting or portions that appear lower than the other areas -- for example, a pool that has one side sagging, but still in tact, or a bird feeder that appears to be sinking.

Look for wilting trees or plants. A sinkhole underneath removes the ground from the roots leaving them hanging underground unable to get nutrients. Bushes or trees where the entire tree or bush seems to have a straight trunk but leaning to one side may indicate a forming hole. Sudden exposed roots may indicate sinking ground.

Observe the surrounding area for a round or oval indentation in the ground. Sinkholes range from several yards wide to only a foot in diameter. The sinkhole appears as a newly depressed area in the ground surface.

Locate the edge of the sinkhole. Stand on the firm side of the edge. Carefully dig into the sunken area. If the ground gives way, get back from the edge because the entire sunken area may begin to collapse.

Kneel down on the edge of the opening. Look into the opening with the flashlight. Determine the depth if you can. Look for tree roots, buried garbage or running water.

Use the camera to photograph the damage. Use the flash on the camera to gain light into the hole.

Test the sides of the sinkhole by digging into the outer edge. If the ground is soft the ground will continue to collapse. Call a professional contractor to determine the best course of action. If the ground is solid determine the depth if you can see the bottom. If the walls and base are solid continue to the next step.

Fill the hole adding 1-foot layers of soil. Tamp down the soil after adding each layer to strengthen the ground.