Environmental Engineering Reference
In-Depth Information
Equation 10.1 uses the soil property parameters
C
s
,
T
, and
S
w
in structuring the relationship
that describes permeability of a soil. These soil property parameters are dependent on soil
composition and soil structure. Assuming that the physical properties of a leachate perme-
ant are not too far distant from that of water at about 20°C, and further assuming a tortuosity
T
value of √2, and
C
s
= 0.4, the graphical relationships shown in Figures 10.5 and 10.6 will be
obtained. These graphs show the relationship between the PKC permeability coeficient
k*
and the amount of surface area wetted in luid low through the soil. A comparison of the
10
-7
10
-8
10
-9
n
= 0.4
n
= 0.3
10
-10
10
-11
10
-12
10
-13
1000
10,000
100,000
Wetted surface area
S
w
(cm
2
/cm
3
)
FIGURE 10.5
Variation of PKC permeability coeficient
k*
with wetted surface area
S
w
and calculated porosity
n
.
10
-05
10
-06
Kaolinite
10
-07
Mudrock
Glacial till
Alluvium
10
-08
Lachenaie
Illite
Micaceous
10
-09
0.2
0.3
0.4
0.5
0.6
Calculated porosity
n
FIGURE 10.6
Variation of PKC permeability coeficient
k*
with calculated porosity in relation to wetted surface area
S
w
.
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