Standard Test Method
(Analytical Procedure) for Determining Transmissivity and
Storage Coefficient of Nonleaky Confined Aquifers by the
Theis Nonequilibrium Method1
This standard is issued under the fixed designation D 4106; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1.1 This test method covers an analytical procedure for
determining the transmissivity and storage coefficient of a
nonleaky confined aquifer. It is used to analyze data on
water-level response collected during radial flow to or from a
well of constant discharge or injection.
1.2 This analytical procedure is used in conjunction with the
field procedure is given in Test Method D 4050.
1.3 Limitations—The limitations of this test method for
determination of hydraulic properties of aquifers are primarily
related to the correspondence between the field situation and
the simplifying assumptions of this test method (see 5.1).
1.4 The values stated in SI units are to be regarded as
1.5 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.
2. Referenced Documents
2.1 ASTM Standards:
D 653 Terminology Relating to Soil, Rock, and Contained
D 4043 Guide for Selection of Aquifer Test Method in
Determining Hydraulic Properties by Well Techniques2
D 4050 Test Method (Field Procedure) for Withdrawal and
Injection Well Tests for Determining Hydraulic Properties
of Aquifer Systems2
3.1.1 aquifer, confined—an aquifer bounded above and
below by confining beds and in which the static head is above
the top of the aquifer.
3.1.2 confining bed—a hydrogeologic unit of less prime.
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