This test method describes a procedure for measuring the
infiltration rate of water through in-place soils using a
double-ring infiltrometer with a sealed inner ring.
This test method is useful for soils with infiltration rates in
the range of 1 × 10−5 cm/s to 1 × 10−8 cm/s.
When infiltration rates ≥1 × 10−5 cm/s are to be
measured Test Method D3385 shall be used.
All observed and calculated values shall conform to the guide
for significant digits and rounding established in Practice
The method used to specify how data are collected, calculated,
or recorded in this standard is not directly related to the
accuracy to which the data can be applied in design or other uses,
or both. How one applies the results obtained using this standard
is beyond its scope.
This test method provides a direct measurement of infiltration
rate, not hydraulic conductivity. Although the units of
infiltration rate and hydraulic conductivity are similar, there is
a distinct difference between these two quantities. They cannot be
directly related unless the hydraulic boundary conditions, such as
hydraulic gradient and the extent of lateral flow of water are
known or can be reliably estimated.
This test method can be used for natural soil deposits,
recompacted soil layers, and amended soils such as soil bentonite
and soil lime mixtures.
Units—The values stated in SI units are to be regarded
as standard. The values given in parentheses are mathematical
conversions to inch-pound units, which are provided for information
only and are not considered standard.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
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