Understanding Sinkholes: A Comprehensive Guide

What Is a Sinkhole?

Sinkholes occur in what is known as karst terrain, where the bedrock under the ground’s surface is soluble. This means that it can be dissolved by water. Limestone and gypsum are among the most common types of karst terrain.

As rainwater passes through the soil into the bedrock, it erodes the rock over time. This can lead to underground caverns and voids that can then fill up with water. A sinkhole forms when the bedrock can no longer support the ground’s surface, causing the land to collapse.

What Causes Sinkholes?

Sinkholes are the result of naturally occurring processes. However, human activity can significantly increase the likelihood of sinkholes in specific areas. For example, rainwater diversion can create channels in the soil, forcing far more runoff into a small patch of bedrock than it would otherwise receive.

Types of Sinkholes

There are two basic types of sinkholes:

1. Cover-subsidence sinkholes: These form from the top down. The ground surface gradually washes away, exposing the bedrock and creating ponds, especially during heavy rains.

   
   

2. Cover-collapse sinkholes: These are far more dramatic, often with few or no warning signs. In this type, the bedrock has been eroding beneath the ground for a long time, unnoticed. When the bedrock can no longer support the land above it, the land suddenly collapses.

   
   

Sinkhole Risks

Fortunately, a sinkhole is localized. Though some can be several feet in diameter and even swallow entire buildings, sinkholes do not spread beyond the area where the bedrock is eroded. The biggest risk comes from being on top of the area where a cover-collapse sinkhole forms. You may have just minutes to get away before toppling into a large hole.

Signs of a Potential Sinkhole

Recognizing the signs of an impending sinkhole is crucial. Look for:

• Leaning trees, signs, or fence posts

• Newly formed areas of ponding water

• Small cracks in a building’s foundation

  
  

If you notice any of these signs, keep a close eye on the area for further development.

What to Do if You Spot a Sinkhole

If you are inside a building or vehicle and feel the ground begin to give way, get out immediately. Make your way on foot several feet away, and then alert emergency personnel. Try to work with others to block off the area where the sinkhole is forming, but do not put yourself at risk.

If a small sinkhole of no more than 3 feet in diameter opens up on your property but is away from any structures, it may be possible to fill it. Contact your trusted asphalt contractor for assistance.

A sinkhole on your property is generally considered your responsibility. However, your homeowner’s insurance may cover any damage, depending on your policy. Have a property inspector and an insurance inspector take a look as soon as possible.

The Importance of Professional Help

When dealing with sinkholes, professional assistance is vital. Experts can assess the situation accurately and provide solutions to prevent further damage. They have the tools and knowledge to handle sinkhole repairs effectively.

Conclusion

In summary, sinkholes are serious geological events that require immediate attention. Understanding their causes and signs can help you act quickly. If you suspect a sinkhole, do not hesitate to reach out to professionals who can assist you in managing the situation safely.

Based in Abbotsford, Topwest Asphalt also serves Langley, Chilliwack, Mission, and Maple Ridge. Are you ready to start your next asphalt project with a team you can count on to do the job right, on time, and on budget? We invite you to call Topwest Asphalt today at 1-800-ASPHALT to discuss your project and schedule an estimate. We look forward to working with you!