Question $7$

Consider the profile through a tailings storage facility shown below.

The decant pond is maintained steady at a depth of $6$ m above the surface of the tailings.

Other details are given in the table below.

i$)$ If the liner were absent $($but $d_1$ and $d_3$ remained unchanged$),$ how much seepage would

enter the groundwater daily if the TSF had an area of $10$ hectares?

ii$)$ What percentage reduction would occur if the $1$ m liner $(d_2)$ had been installed?

What is the head loss across the liner in this case?

iii$)$ If a $3$ m thick layer of fine tailings $(k={10}^{-6}c\frac{m}{sec})$ had accumulated on top of the liner

before the tailings with $k_1={10}^{-5}c\frac{m}{sec}$ were deposited $($assume $d_1=37m),$ what would the

seepage volume be$?$