Question:
The term piezometric surface is used for which of the following types of aquifers?
The term piezometric surface is used for which of the following types of aquifers?
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Confined Aquifer $\rightarrow$ Piezometric Potentiometric surface.
Unconfined Aquifer $\rightarrow$ Water table Phreatic surface.
Unconfined Aquifer $\rightarrow$ Water table Phreatic surface.
Updated On: Sep 4, 2026
- Unconfined aquifer
- Confined aquifer
- Semi confined aquifer
- Perched aquifer
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
A confined (artesian) aquifer is trapped between two impermeable confining aquitards/aquicludes under hydrostatic pressure exceeding atmospheric pressure.
Key Formula or Approach:
\[ h = z + \frac{P}{\gamma} \quad \text{(Piezometric / Potentiometric Head)} \]
Step 2: Detailed Explanation:
In groundwater hydraulics:
- Confined Aquifer: Water is under artesian pressure. When a borehole penetrates the upper confining layer, water rises in the casing to an imaginary equilibrium level known as the piezometric surface (or potentiometric surface).
- Unconfined Aquifer: The upper boundary is the actual physical water table (phreatic surface) at atmospheric pressure.
- Perched Aquifer: A localized lens of groundwater supported above the regional water table by a localized impermeable clay lens.
Step 3: Final Answer:
Thus, the term piezometric surface is used for a Confined aquifer, matching option (B).
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