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4.
Methodology of the experimetal procedure
4.1
Infiltration tests with different water tensions
The Hood Infiltrometer allows the infiltration test at different water tensions up to the bubble point
of the soil or the membrane below the infiltration chamber (radius a).
For neighboring values of the chosen water tensions (h
1
, h
2
) applies according to equations (1), (2):
)
4
1
(
1
2
1
a
e
k
a
Q
h
f
(3)
)
4
1
(
2
2
2
a
e
k
a
Q
h
f
(4)
By way of division we get:
)
(
)
ln(
2
1
2
1
h
h
Q
Q
(h1, h2 < 0)
(5)
And for the hydraulic conductivities we get:
)
4
1
(
)
(
2
1
1
a
a
Q
h
k
(6)
)
4
1
(
)
(
2
2
2
a
a
Q
h
k
(7)
To run an infiltration test with a water tension lower than the bubble point use the infiltra-
tion chamber to make up a tension infiltrometer. Mind the influence of the contact mate-
rial between soil and tension chamber, as here the “series connection” from contact mate-
rial and soil will become effective.
