ASTM D 4104 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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ASTM D 4104 Document Information:
Title
Standard Test Method (Analytical Procedure) for Determining Transmissivity of Nonleaky Confined Aquifers by Overdamped Well Response to Instantaneous Change in Head (Slug Tests)
ASTM International
Publication Date:
Oct 10, 1996
Scope:
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.
The analytical procedure in this test method is used in conjunction
with the field procedure in
Test Method D 4044 for collection of test data.
Limitations - Slug tests are considered to provide an estimate of
transmissivity. 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.
The values stated in SI units are to be regarded as 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.
Keywords:
- aquifers
- aquifer tests
- control wells
- ground water
- hydraulic conductivity
- observation wells
- storage coefficient storativity
- transmissivity
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