Question

A soil core is taken from the site. The sample was weighed, then saturated with water and weighed, then drained by gravity and weighed, and finally dried and weighed. The results are:

Total Vol of soil core 280 cm3

wt of sample at field condition 544g

saturated wt 572g

drained wt 532g

dry wt 482g

Calculate:

a. porosity

b. specific yield

c. dry bulk density

d. saturation (at field condition)

Answer 1

POROSITY,n=0.321=32.1%

SPECIFIC YIELD OR DRAINABLE POROSITY = 0.142 =14.2 %

DRY BULK DENSITY = 1.72 g/cc

SATURATION @FIELD = 68.8%