Question

In which layers is a leaky aquifer typically bounded by

• A. Impermeable layers
• B. Semi-permeable layers
• C. Clay layers
• D. Rock layers

Hint:

Aquifer types: \[ \boxed{ \begin{aligned} \text{Confined aquifer} &\rightarrow \text{Impermeable layers}\\ \text{Leaky aquifer} &\rightarrow \text{Semi-permeable layers}\\ \text{Unconfined aquifer} &\rightarrow \text{Free water table} \end{aligned} } \]

Answer 1

The Correct Option is B

Step 1: Recall what a leaky aquifer means.
A leaky, or semi-confined, aquifer is not fully sealed off the way a strictly confined aquifer is.
Step 2: Identify the bounding layers.
It sits between aquitards, layers that are not fully impermeable but still let a limited, slow amount of water leak through vertically, which is why some water can seep in or out.
Step 3: Rule out the stricter descriptions.
Fully impermeable layers, plain clay, or generic rock layers would either stop all leakage or are too vague to describe the semi-permeable behaviour that defines a leaky aquifer.
\[ \boxed{\text{Semi-permeable layers}} \]