In a three-layered soil system, the thicknesses of the top and bottom layers each are half the thickness of the middle layer. The coefficients of permeability of top and bottom layers each are double the coefficients of permeability k of the middle layer. When horizontal flow occurs, the equivalent coefficient of permeability of the system will be

Q. In a two-layer soil system, the top soil and bottom soil are of same thickness but the coefficient of permeability of the top soil is twice that of the bottom soil of coefficient of permeability 'k'. When horizontal flow occurs, the equivalent coefficient of permeability of the system will be

Q. A stratum of soil consists of three layers of equal thickness. The permeability of both the top and the bottom layers is 10${}^{-4}$cm/s; and that of the middle layer is 10${}^{-3}$ cm/s; then the value of the horizontal coefficient of permeability for the entire composite of the soil layers is

Q. A non-homogenous soil deposit consists of a slit layer sandwiched between the fine-sand layer at top and clay layer below. Permeability of the silt layer is 10 times the permeability of the clay layer and one-tenth of the permeability of the sand layer. Thickness of the silt layer is 2 times the thickness of the sand layer and two-third of the thickness of the clay layer. The ratio of equivalent horizontal and equivalent vertical permeability of the deposit is.

Q. A soil deposit has three layers having same thickness each but the permeabilities of the layers are in the ratio of 1 : 2 : 4 from top to bottom.
What is the ratio of average permeability in the horizontal direction to that in the vertical direction?

Q. 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