ASTM D 5472 Standard Test Method for Determining Specific Capacity and Estimating Transmissivity at the Control Well
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ASTM D 5472 Document Information:
Title
Standard Test Method for Determining Specific Capacity and Estimating Transmissivity at the Control Well
ASTM International
Publication Date:
Nov 15, 1993
Scope:
This test describes a procedure for conducting a specific capacity
test, computing the specific
capacity of a control well, and estimating the transmissivity in the
vicinity of the control well.
Specific capacity is the well yield per unit drawdown at an identified
time after pumping started.
This test method is used in conjunction with Test Method D 4050 for
conducting withdrawal and
injection well tests.
The method of determining transmissivity from specific capacity is a
variation of the
nonequilibrium method of Theis (1) for determining transmissivity and
storage coefficient of
anaquifer. The Theis nonequilibrium method is given in Test Method D
4106.
Limitations - The limitations of the technique for determining
transmissivity are primarily related
to the correspondence between the field situation and the simplifying
assumptions of the Theis
method.
The values stated in SI units are to be regarded as standard.
This standard may involve hazardous materials, operations, and
equipment. This standard does not
address safety problems 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
- hydraulic conductivity
- observation wells
- specific capacity
- storage coefficient
- transmissivity
- unconfined aquifers
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