Last updated on June 13th, 2021 at 09:15 am
Water is one of the greatest gifts of nature to humanity. It is our responsibility to use it wisely and save water as much as possible. Water is present underneath us. When we pump water from underground by constructing a well, certain changes happen in the water table. It is important to know about these changes for all the private well owners, so they can value their water and use it more sensibly.
In this article, we are going to discuss how water table changes around pumping water well.
To understand the concept of groundwater, you need to look at the following diagram. USGS has explained the concept of changing the water table around water wells and aquifers.
As you can see, the unsaturated zone does not contain any water, the saturated zone is filled with water, and once the land surface reaches the water table, surface water gets in level to the ground. Groundwater occurs in the saturated soil and rock below the water table. When people drill wells, the water starts to flow towards the well, and you can pump water out of it. The level of water changes due to pumping, and as a result, a cone of depression is formed. The following image will illustrate the process of the formation of the cone of depression.
The changes in the water table can happen due to pumping water or changes in weather, precipitation pattern, geologic changes, and human activities. If the water is withdrawn at a faster rate than the rate of replenishment, the cone of depression happens.
The impacts of drilling water can be short-lived or either long-term. If water is pumped at a faster rate and excessively, aquifers with a low water reservoir can go dry, and you will not receive water from it.