SSC 107
Problem set 3
Date: Oct. 18, 2002
Due: October 25, 2002
1. In which direction will water flow from A to B, B to A or no flow, if the following pieces of
soil are placed in contact with each other? Why?
a. b.
sand θ =0.4 clay θ =0.2 sand θ =0.25 sand θ =0.25
T=10oC T=40oC
c. d.
sand h =-10cm clay h =-10cm clay h =-10cm clay h =-10cm
10g NaCL/100cm3 1g NaCL/100cm3
e
semi-permeable membrane
clay h = -10cm clay h =-10cm
10g NaCL/100cm3 1g NaCL/100cm3
2. (a). A 50-cm long soil column containing packed sand with a saturated hydraulic
conductivity of 80 cm/day is placed vertically with the bottom open to the atmosphere. A
constant 10-cm of water is ponded continuously on the top surface. Calculate the steady state
flux density through the soil. And how much water will drain from the soil column during 5
hours, if the cross sectional area of the column is 10 cm2.
(b). Assume that the same soil column is placed horizontally, with 10 cm of water ponded on
the left side while the right side is open to the atmosphere. Calculate the flux through the soil
column.
A B A B
A B A B
A B
