Question:
Perched water table is found in
Perched water table is found in
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Think of a perched water table as an "island of water" held up by a small clay lens, completely surrounded by unsaturated soil above the main water table of an unconfined aquifer.
Updated On: Jul 21, 2026
- Confined acquifer
- Semi confined acquifer
- Uncofined acquifer
- Both confined and unconfined acquifer
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
A perched water table is a localized, saturated zone of groundwater that accumulates above an impermeable or semi-permeable layer of soil or rock (such as a clay lens).
This saturated zone is separated from the main underlying water table by an unsaturated zone.
Detailed Explanation:
- Perched water tables occur in the unsaturated zone (vadose zone) of an unconfined aquifer.
- When percolating rainwater or irrigation water moves downward through the soil profile, its progress is blocked by a localized, impermeable horizontal stratum.
- This causes the water to pool and saturate the soil directly above the impermeable barrier, creating a secondary, localized "perched" water table.
- Since this phenomenon occurs in the unsaturated zone above the primary water table and is open to atmospheric pressure, it is classically associated with and situated within unconfined aquifers.
- Confined and semi-confined aquifers are bounded by continuous regional confining layers, which prevent the formation of such localized perched tables.
Step 2: Final Answer:
A perched water table is physically found in an unconfined aquifer. This corresponds to option (C).
A perched water table is a localized, saturated zone of groundwater that accumulates above an impermeable or semi-permeable layer of soil or rock (such as a clay lens).
This saturated zone is separated from the main underlying water table by an unsaturated zone.
Detailed Explanation:
- Perched water tables occur in the unsaturated zone (vadose zone) of an unconfined aquifer.
- When percolating rainwater or irrigation water moves downward through the soil profile, its progress is blocked by a localized, impermeable horizontal stratum.
- This causes the water to pool and saturate the soil directly above the impermeable barrier, creating a secondary, localized "perched" water table.
- Since this phenomenon occurs in the unsaturated zone above the primary water table and is open to atmospheric pressure, it is classically associated with and situated within unconfined aquifers.
- Confined and semi-confined aquifers are bounded by continuous regional confining layers, which prevent the formation of such localized perched tables.
Step 2: Final Answer:
A perched water table is physically found in an unconfined aquifer. This corresponds to option (C).
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