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4.2
Infiltration tests with identical water tensions
On infiltration with identical water tensions from infiltration hoods with different radii ap-
plies for the respective flow rate:
When choosing the source areas with a ration of (10) we get:
1
2
F
q
F
2
a
F
(10)
)
1
(
)
1
(
4
2
1
1
2
1
Q
Q
q
a
Q
Q
q
(11)
Now ku and
can be determined for an unknown soil using (11), (8) and (1). As different
soil sections are effective in each test run, soil inhomogeneities will sometimes lead to in-
valid results. In such experiments, equation (11) should be used only for representative
means of the infiltration rates of the infiltration hoods under review.
)
4
1
(
)
(
1
2
1
1
a
a
Q
h
k
(8)
)
4
1
(
)
(
2
2
2
2
a
a
Q
h
k
(9)
