Figure $2.$ A constant$-$head test

Figure $3.$ A falling$-$head test

$3.$ In a constant$-$head permeability test $($see Figure $2$ too$),$ the length of the specimen is $150mm$ and the cross$-$sectional area is $3167m{m}^2.$ If $k=0\mathrm{.}062c\frac{m}{sec}$ and a rate of flow of $160c\frac{m^3}{m}in$ has to be maintained during the test, what should be the head difference across the specimen? Also, determine the discharge velocity under the test conditions $($assume specimen $e=0\mathrm{.}7).$