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Significance and Use
Note 7: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice does not in itself assure reliable results. Reliable results depend on many factors; Practice provides a means of evaluating some of those factors.
5.1 Assumptions—Leaky Aquifer:
5.1.1 Drawdown (sW) in the control well is constant,
5.1.2 Well is infinitesimal diameter and fully penetrates aquifer,
5.1.3 The aquifer is homogeneous, isotropic, and areally extensive, and
5.1.4 The control well is 100 % efficient.
5.2 Assumptions—Nonleaky Aquifer:
5.2.1 Drawdown (sW) in the control well is constant,
5.2.2 Well is infinitesimal diameter and fully penetrates aquifer,
5.2.3 The aquifer is homogeneous, isotropic, and areally extensive,
5.2.4 Discharge from the well is derived exclusively from storage in the nonleaky aquifer, and
5.2.5 The control well is 100 % efficient.
5.3 Implications of Assumptions:
5.3.1 The assumptions are applicable to confined aquifers and fully penetrating control wells. However, this test method may be applied to partially penetrating wells where the method may provide an estimate of hydraulic conductivity for the aquifer adjacent to the open interval of the well if the horizontal hydraulic conductivity is significantly greater than the vertical hydraulic conductivity.
5.3.2 Values obtained for storage coefficient are less reliable than the values calculated for transmissivity. Storage coefficient values calculated from control well data are not reliable.
1.1 This test method covers an analytical solution for determining transmissivity and storage coefficient of a leaky or nonleaky confined aquifer. It is used to analyze data on the flow rate from a control well while a constant head is maintained in the well.
1.2 This analytical procedure is used in conjunction with the field procedure in Practice .
1.3 Limitations—The limitations of this technique for the determination of hydraulic properties of aquifers are primarily related to the correspondence between field situation and the simplifying assumption of the solution.
1.4 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values in each system may not be exact equivalents; therefore each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method.
1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice .
1.6 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.
ICS Number Code 13.060.10 (Water of natural resources)
ASTM D5855 / D5855M-15, Standard Test Method for (Analytical Procedure) for Determining Transmissivity and Storage Coefficient of Confined Nonleaky or Leaky Aquifer by Constant Drawdown Method in Flowing Well, ASTM International, West Conshohocken, PA, 2015, www.astm.orgBack to Top