A falling$-$head permeameter test is to be performed on a sample of sandy silt. The sample is a cylinder $25$

$cm$ long and $5cm$ in diameter. The burette diameter is $8mm.$ How long in seconds it takes for a given

head to decrease by $40$ percent? The conductivity of the soil is $K=0\mathrm{.}0282$ m$/$day$.$

A$).$ Estimate the time of the experiment.

B$)$ All of the conditions of this experiment are fixed but heating oil is used instead of water. Does the

experiment time increase or decrease to reach the same level of head reduction in this test.

$($Refer to table in the page $22$ of lecture $2$ for fluid properties$)$

Increase$)$ Decrease$)$ No change$)$

C$)$ c$)$ If the mean grain diameter of the sample is $0\mathrm{.}04cm,$ what is the maximum specific discharge

of the heating oil such that a laminar flow is maintained?