$10$ marks

$($b$)$ Groundwater flows with a velocity of $6{10}^{-5}\frac{m}{s}$ through a confined aquifer. The pressure in the aquifer is $35k\frac{N}{m^2},$ and the elevation of the aquifer with respect to mean sea level is $13m$ :

Calculate the total energy per unit weight of the fluid in the aquifer.

Calculate the total energy per unit mass of the fluid in the aquifer.

$5$ marks

$5$ marks

If the effective porosity of the aquifer is $0\mathrm{.}3,$ calculate the actual velocity of groundwater flow.

$5$ marks