Standard Test Method
(Analytical Procedure) for Determining Transmissivity and
Storage Coefficient of Nonleaky Confined Aquifers by the
Modified Theis Nonequilibrium Method1
This standard is issued under the fixed designation D 4105; 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 (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 under conditions of radial flow to a fully
penetrating well of constant flux. This test method is a shortcut
procedure used to apply the Theis nonequilibrium method. The
This method is described in Test Method D 4106.
1.2 This test method is used in conjunction with the field
the procedure is given in Test Method D 4050.
1.3 Limitations—The limitations of this test method are
primarily related to the correspondence between the field
situation and the simplifying assumptions of this test method
(see 5.1). Furthermore, the application is valid only for values of u
less than 0.01 (u is defined in Eq 2, in 8.6).
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
D 4106 Test Method (Analytical Procedure) for Determining Transmissivity and Storage Coefficient of Nonleaky
Confined Aquifers by the Theis Nonequilibrium Method2
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