ASTM-D4104 › Standard Test Method (Analytical Procedure) for Determining Transmissivity of Nonleaky Confined Aquifers by Overdamped Well Response to Instantaneous Change in Head (Slug Tests)
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Scope
1.1 This test method covers the determination of transmissivity from the measurement of force-free (overdamped) response of a well-aquifer system to a sudden change of water level in a well. Force-free response of water level in a well to a sudden change in water level is characterized by recovery to initial water level in an approximate exponential manner with negligible inertial effects.
1.2 The analytical procedure in this test method is used in conjunction with the field procedure in Test Method
1.3 Limitations -Slug tests are considered to provide an estimate of transmissivity. The determination of aquifer storage coefficient is less reliable. Although the assumptions of this test method prescribe a fully penetrating well (a well open through the full thickness of the aquifer), the slug test method is commonly conducted using a partially penetrating well. Such a practice may be acceptable for application under conditions in which the aquifer is stratified and horizontal hydraulic conductivity is much greater than vertical hydraulic conductivity. In such a case the test would be considered to be representative of the average hydraulic conductivity of the portion of the aquifer adjacent to the open interval of the well.
1.4 The values stated in SI units are to be regarded as standard.
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.
Keywords
Aquifers; Control wells; Field testing-ground water/aquifers; Ground water; Hydraulic conductivity; Instantaneous head test; Observation wells; Overdamped well response; Slug tests; Storativity; Transmissivity and reflectivity; ICS Number Code 13.060.10 (Water of natural resources)
To find similar documents by ASTM Volume:
04.08 (Soil and Rock (I): D420 - D5876)
To find similar documents by classification:
13.060.10 (Water of natural resources)
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Document Number
ASTM-D4104_D4104M-20
Revision Level
2020 EDITION
Status
Current
Modification Type
Revision
Publication Date
June 29, 2020
Document Type
Test Method
Page Count
5 pages
Committee Number
D18.21