$3-(15$ Points$)$ A well fully penetrates a confined aquifer of thickness $20m.$ The hydraulic

conductivity is $0\mathrm{.}0001\frac{m}{s}$ and the storage coefficient is $0\mathrm{.}001.$ Determine the time $t$ at which the

drawdown at a point $50m$ from the well becomes $10m$ when the well is pumped at a rate of $0\mathrm{.}03$

$\frac{m^3}{s}$ a$)$ by using Jacob simplified solution; and b$)$ by using the complete well function. $[$a$)t=$

$27\mathrm{.}9$ days; b$)t=26\mathrm{.}5$ days