ASTM D4444-13
ASTM D4630-96(2008)..
ASTM D4696-92(2008)..
ASTM D4700-91(2006)..
ASTM D5012-01(2013)..
ASTM D5032-11
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ASTM D5881-13
Standard Test Method for (Analytical Procedure) Determining Transmissivity of Confined Nonleaky Aquifers by Critically Damped Well Response to Instantaneous Change in Head (Slug)
STANDARD published on 15.11.2013
The information about the standard:
Designation standards: ASTM D5881-13
Note: WITHDRAWN
Publication date standards: 15.11.2013
SKU: NS-32928
The number of pages: 10
Approximate weight : 30 g (0.07 lbs)
Country: American technical standard
Category: Technical standards ASTM
The category - similar standards:
Annotation of standard text ASTM D5881-13 :
Keywords:
aquifer, aquifer tests, groundwater, hydraulic conductivity, observation wells, slug test, storage coefficient, transmissivity, ICS Number Code 07.060 (Geology. Meteorology. Hydrology)
Additional information
| Significance and Use | ||||||||||||
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6.1 The assumptions of the physical system are given as follows: 6.1.1 The aquifer is of uniform thickness, with impermeable upper and lower confining boundaries. 6.1.2 The aquifer is of constant homogeneous porosity and matrix compressibility and constant homogeneous and isotropic hydraulic conductivity. 6.1.3 The origin of the cylindrical coordinate system is taken to be on the well-bore axis at the top of the aquifer. 6.1.4 The aquifer is fully screened. 6.1.5 The well is 100 % efficient, that is, the skin factor, f, and dimensionless skin factor, σ, are zero. 6.2 The assumptions made in defining the momentum balance are as follows: 6.2.1 The average water velocity in the well is approximately constant over the well-bore section. 6.2.2 Frictional head losses from flow in the well are negligible. 6.2.3 Flow through the well screen is uniformly distributed over the entire aquifer thickness. 6.2.4 Change in momentum from the water velocity changing from radial flow through the screen to vertical flow in the well are negligible. 1.1 This test method covers
determination of transmissivity from the measurement of water-level
response to a sudden change of water level in a well-aquifer system
characterized as being critically damped or in the transition range
from underdamped to overdamped. Underdamped response is
characterized by oscillatory changes in water level; overdamped
response is characterized by return of the water level to the
initial static level in an approximately exponential manner.
Overdamped response is covered in Guide D4043; underdamped response
is covered in D5785, D4043.
1.2 The analytical procedure in this test method is used in conjunction with Guide D4043 and the field procedure in Test Method D4044 for collection of test data. 1.3 Limitations—Slug tests are considered to provide an estimate of the transmissivity of an aquifer near the well screen. The method is applicable for systems in which the damping parameter, ζ, is within the range from 0.2 through 5.0. The assumptions of the method prescribe a fully penetrating well (a well open through the full thickness of the aquifer) in a confined, nonleaky aquifer. 1.4 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026. 1.5 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5.1 The procedures used to specify how data are collected/recorded or calculated, in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives and it is common practice to increase to reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analytical methods for design. 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. |
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