GEOLOGY

Detailed explanation-1: -Groundwater in an unconfined aquifer (some-times called a “water table aquifer”) is more vulnerable to contamination from surface pollution than a confined aquifer because pollutants on the land surface can enter the unconfined aquifer as water infiltrates the soil.

Detailed explanation-2: -Unconfined aquifers generally are much more vulnerable to contamination than confined aquifers. For a well in a confined aquifer, the farther the well is from the unconfined area, the less vulnerable it is to contamination. Generally, the deeper the well, the less vulnerable it is to contamination.

Detailed explanation-3: -Unconfined sand and gravel aquifers are more vulnerable to contamination.

Detailed explanation-4: -which is more likely to be contaminated? an unconfined aquifer recharges quicker because a confined one cannot be reached by falling water because it can’t penetrate the impermeable layer of rock surrounding it.

Detailed explanation-5: -Unconfined aquifers form at a quicker rate compared to confined aquifers. This is because they are in closer proximity to water sources from rain, streams or rivers. By contrast, confined aquifers are fed by underground tributaries.