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0.35
Saturated volumetric
water content = porosity
of soil,
n
=30%
0.30
0.25
0.20
Drying
Wetting
0.15
0.10
0.05
0.00
0.1
1
1
0
100
Matric suction (
u
a
-
u
w
), kP a
(a)
5.0
Saturated coefficient
of permeability,
k
s
=4.3x10
−
6
m/s
4.0
3.0
Drying
Wetting
2.0
1.0
0.0
0.1
1
10
100
Matric suction (
u
a
-
u
w
), kPa
(b)
Figure 7.12
Similar forms of hysteresis for volumetric water content and water coefficient of
permeability when plotted as function of matric suction
(u
a
−
u
w
)
for sand: (a) volumetric water
content versus matric suction; (b) water coefficient of permeability versus matric suction.
10
−
4
10
−
5
Wetting
Drying
10
−
6
10
−
7
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
Volumetric water content (
θ
)
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