What is a disadvantage of using a confined aquifer for water supply?

• A. It is easily depleted
• B. It is unprotected from contamination
• C. It requires extensive treatment
• D. It is expensive to use

Answer: (A)

A confined aquifer can be subject to significant pressure from the water it contains, which can make it a reliable source of water supply. However, a notable disadvantage is that it can lead to over-extraction and depletion if the withdrawal rate exceeds the natural recharge rate. Since water in confined aquifers is often stored in layers of rock and sediment that are less permeable, this can result in depletion that is not easily recovered. Therefore, careful management is required to avoid depletion, which highlights the challenges associated with using confined aquifers for sustainable water supply.

In contrast, the other options mentioned do not accurately reflect the characteristics of confined aquifers. They tend to be more protected from contamination due to the layers of material above them and may not necessarily require extensive treatment if the water quality is good. Additionally, while there can be costs associated with accessing confined aquifers, this does not universally make them expensive compared to other water sources.