Question $2[5]$

An $82\mathrm{.}5$ mm diameter permeameter contains a sand column $460$ mm long. When water flows

through under a constant head at the rate of $191m\frac{l}{m}in,$ the head loss between two tapping points

$250$ mm apart is $380$ mm $.$ Calculate the sand's coefficient of permeability.

Question $3[7]$

A pumping test was carried out in sand extending from ground level to a depth of $25$ m $,$ at which

an impermeable stratum was encountered. The initial water table level coincided with the ground

surface. Observation wells were positioned at $4$ m and $8$ m from the pumping well. When a steady

state of pumping was established, the discharge rate was $8$ litres $\frac{?}{sec}.$ The draw$-$downs in the two

observation wells were $2$ m and $0,5m,$ respectively. Calculate the average coefficient of

permeability of the sand in $\frac{m}{sec}.$

Question $4[4]$

The temperature of the water in the laboratory to calculate the permeability in question $3$ was $20$

degrees Celsius. If the groundwater in the field is at temperature of $10$ degrees Celsius, find the

field permeability