Driven wells are practical only when the water-bearing formations are relatively close to the surface and no contaminants exist in the soil. Which option best reflects this condition?

Driven wells are practical only when the water-bearing formations are relatively close to the surface and no contaminants exist in the soil. Which option best reflects this condition?

• A. They are simple to install and require the formations to be relatively close to the surface with no contaminants in the soil
• B. They are relatively cost effective to install, within 80 ft of the surface and no contaminants exist
• C. They are simple to install, with contaminants present but acceptable
• D. They are expensive and require deep drilling regardless of surface conditions

Answer: (A)

Driven wells work best when the water source sits near the surface and the surrounding soil is clean. Because the well is created by driving a casing into a shallow aquifer, installation is straightforward and typically inexpensive. If there are contaminants in the soil, they can enter the well or travel along the outside of the casing, risking water quality and undermining the practicality of a driven design. So the scenario described—an aquifer relatively close to the surface with no soil contaminants—fits why driven wells are considered practical: they’re simple to install and rely on a clean, near-surface source. The other options introduce a fixed depth, contamination that would compromise suitability, or imply deep, costly drilling, which doesn’t align with how driven wells are typically used.

Driven wells work best when the water source sits near the surface and the surrounding soil is clean. Because the well is created by driving a casing into a shallow aquifer, installation is straightforward and typically inexpensive. If there are contaminants in the soil, they can enter the well or travel along the outside of the casing, risking water quality and undermining the practicality of a driven design. So the scenario described—an aquifer relatively close to the surface with no soil contaminants—fits why driven wells are considered practical: they’re simple to install and rely on a clean, near-surface source. The other options introduce a fixed depth, contamination that would compromise suitability, or imply deep, costly drilling, which doesn’t align with how driven wells are typically used.