Cover-collapse sinkholes can open up suddenly.
![Diagram showing how cover-collapse types of sinkholes develop.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/wss-gw-sinkholes-cover-collapse.gif?itok=jvxooDzE)
Detailed Description
Cover-collapse sinkholes
Cover-collapse sinkholes may develop abruptly (over a period of hours) and cause catastrophic damages. They occur where the covering sediments contain a significant amount of clay. Over time, surface drainage, erosion, and deposition of sinkhole into a shallower bowl-shaped depression.
Sources/Usage
Public Domain.