Question

An aquifer confined at top and bottom by impermeable layers is stratified into three layers as follows:
$\begin{array}{ccc}\text{Layer}& \text{Thickness}& \text{Permeability}\\ & \text{(m)}& \text{(m/day)}\\ \text{Top layer}& 4& 30\\ \text{Middle layer}& 2& 10\\ \text{Bottom layer}& 6& 20\end{array}$

The transmissivity (${\text{m}}^2$/day) of the aquifer is

• A. 260
• B. 227
• C. 80
• D. 23

Answer 1

The correct option is A 260

Transmissibility,
$T=\sum kd$
$=(4\times 30)+(2\times 10)+(6\times 20)$
$=120+20+120=260{\text{m}}^2/\text{day}$