$4\mathrm{.}4\mathrm{.}0$ ror une une$-$drawdown data listed below for a confined aquifer, calculate $T$ and $S$ using Jacob's approximation. After computing $T$ and $S,$ check to see that the basic assumption of this approximation is satisfied. For the values of $T$ and $S$ that you computed, after how many minutes of pumping would Jacob's approximation be valid? The discharge is $Q=1,500gpm$ and the radius $r=300ft.$

$\backslash$table$[[$Time after pumping started $(min),$Drawdown $(ft)$