${?}^2-6$ In a falling head permeability test the initial head of $2750mm$ dropped to $1530mm$ in $200$min, the

diameter of the standpipe being $14mm.$ The soil specimen was $200mm$ long by $88mm$ in diameter. The

coefficient of permeability of the soil in $m\frac{m}{h}r$ is $(2dp)$ :

$0\mathrm{.}89$

${?}_{1\mathrm{.}2}$ Afalling.head pemeameter has a diameter of $29\mathrm{.}7mm.$ The soil sample is $165\mathrm{.}6mm$ long, The stand

pipe dianneter is $6\mathrm{.}65mm,$ During the test the water head fell from $0\mathrm{.}152m$ to $0\mathrm{.}07m$ in $1\mathrm{.}2hrs.$ The

permeability in $\frac{m}{h}r$ of the soil is $(4dp)$ :