What does the process of well rehabilitation typically involve?

The process of well rehabilitation is crucial for maintaining the efficiency and functionality of water wells. It typically involves removing sediment and mineral build-up that can accumulate over time in the well and its surrounding formations. This build-up can significantly reduce the flow of water and the overall quality of the supply.

Well rehabilitation techniques often include methods such as backwashing, acidizing, or using physical tools to clear away obstructions. By addressing these issues, the well's capacity to deliver water can be restored, which improves the yield and prevents future operational problems. This process helps ensure that the water remains potable and meets safety standards.

Shutting down the water supply is generally a step necessary during the rehabilitation process to ensure safety, but it does not directly relate to the core of what rehabilitation entails. Draining the entire aquifer would be detrimental and is not feasible in practice. Replacing the well structure may be a more drastic measure and isn't part of standard rehabilitation practices unless the well is damaged beyond repair. Hence, removing sediment and mineral build-up is the primary focus of well rehabilitation, making it the correct answer.