ASTM D5912-20

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D5912 −20
Standard Practice for
(Analytical Procedure) Determining Hydraulic Conductivity
of an Unconfined Aquifer by Overdamped Well Response to
1
Instantaneous Change in Head (Slug)
This standard is issued under the fixed designation D5912; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* this standard. Reporting of test results in units other than SI
shall not be regarded as nonconformance with this standard.
1.1 This practice covers the determination of hydraulic
conductivity from the measurement of inertial force free
1.5 All observed and calculated values shall conform to the
(overdamped) response of a well-aquifer system to a sudden
guidelines for significant digits and rounding established in
change in water level in a well. Inertial force free response of
Practice D6026.
the water level in a well to a sudden change in water level is
1.5.1 Theproceduresusedtospecifyhowdataarecollected/
characterized by recovery to initial water level in an approxi-
recorded and calculated in the standard are regarded as the
mate exponential manner with negligible inertial effects.
industry standard. In addition, they are representative of the
1.2 The analytical procedure in this practice is used in
significant digits that generally should be retained. The proce-
conjunction with the field procedure in Test Method D4044/
dures used do not consider material variation, purpose for
D4044M for collection of test data.
obtaining the data, special purpose studies, or any consider-
1.3 Limitations—Slug tests are considered to provide an
ations for the user’s objectives; and it is common practice to
estimate of hydraulic conductivity. The determination of stor-
increase or reduce significant digits of reported data to be
agecoefficientisnotpracticablewiththispractice.Becausethe
commensuratewiththeseconsiderations.Itisbeyondthescope
volume of aquifer material tested is small, the values obtained
of these test methods to consider significant digits used in
arerepresentativeofmaterialsveryneartheopenportionofthe
analysis methods for engineering data.
control well.
1.6 This practice offers a set of instructions for performing
NOTE 1—Slug tests are usually considered to provide estimates of the
one or more specific operations. This document cannot replace
lower limit of the actual hydraulic conductivity of an aquifer because the
test results are so heavily influenced by well efficiency and borehole skin
educationorexperienceandshouldbeusedinconjunctionwith
effects near the open portion of the well. The portion of the aquifer that is
professional judgment. Not all aspects of the practice may be
testedbytheslugtestislimitedtoanareaneartheopenportionofthewell
applicable in all circumstances. This ASTM standard is not
wheretheaquifermaterialsmayhavebeenalteredduringwellinstallation,
intended to represent or replace the standard of care by which
and therefore may significantly impact the test results. In some cases, the
data may be misinterpreted and result in a higher estimate of hydraulic
the adequacy of a given professional service must be judged,
conductivity.Thisisduetotherelianceonearlytimedatathatisreflective
nor should this document be applied without the consideration
of the hydraulic conductivity of the filter pack surrounding the well. This
2 ofaproject’smanyuniqueaspects.Theword“Standard”inthe
effect was discussed by Bouwer (1). In addition, because of the reliance
title of this document means only that the document has been
on early time data, in aquifers with medium to high hydraulic
conductivity, the early time portion of the curve that is useful for this data
approved through he ASTM consensus process.
analyses is too short (for example, <10 s) for accurate measurement;
1.7 This standard does not purport to address all of the
therefore, the test results begin to greatly underestimate the true hydraulic
conductivity.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
1.4 Units—The values stated in SI units are to be regarded
as the standard. No other units of measurement are included in priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1
This practice is under the jurisdiction of ASTM Committee D18 on Soil and
1.8 This international standard was developed in accor-
Rock and is the direct responsibility
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