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Standard Test Method for (Analytical Procedure for) Analyzing the Effects of Partial Penetration of Control Well and Determining the Horizontal and Vertical Hydraulic Conductivity in a Nonleaky Confined Aquifer
Automaticky přeložený název:
Standardní zkušební metoda pro ( analytický postup k ) analýzy účinků Částečná penetraci kontrolní jamky a stanovení horizontální a vertikální hydraulická vodivost v Nonleaky napjatého kolektoru
NORMA vydána dne 1.11.2015
Označení normy: ASTM D5473/D5473M-15
Poznámka: NEPLATNÁ
Datum vydání normy: 1.11.2015
Kód zboží: NS-622437
Počet stran: 17
Přibližná hmotnost: 51 g (0.11 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
anistroph, aquifers, aquifer tests, control wells, ground water, hydraulic conductivity, observation wells, storage coefficient, transmissivity,, ICS Number Code 13.060.10 (Water of natural resources)
Significance and Use | ||||||||||
5.1 Assumptions: 5.1.1 Control well discharges at a constant rate, 5.1.2 Control well is of infinitesimal diameter and partially penetrates the aquifer. 5.1.3 The nonleaky artesian aquifer is homogeneous, and aerially extensive. The aquifer may also be anisotropic and, if so, the directions of maximum and minimum hydraulic conductivity are horizontal and vertical, respectively. The methods may be used to analyze tests on unconfined aquifers under conditions described in a following section. 5.1.4 Discharge from the well is derived exclusively from storage in the aquifer. 5.1.5 The geometry of the assumed aquifer and well conditions are shown in Fig. 2. 5.2 Implications of Assumptions—The vertical
flow components in the aquifer are induced by a control well that
partially penetrates the aquifer, that is, a well that is not open
to the aquifer through its full thickness. The effects of vertical
flow components are measured in piezometers near the control well,
that is, within a distance, r, in which vertical flow components are
significant, that is: 5.3 Application of Method to Unconfined Aquifers: 5.3.1 Although the assumptions are
applicable to artesian or confined conditions, Weeks (1) has pointed out that the
solution may be applied to unconfined aquifers if drawdown is small
compared with the saturated thickness of the aquifer or if the
drawdown is corrected for reduction in thickness of the aquifer,
and the effects of delayed gravity response are small. The effects
of gravity response become negligible after a time as given, for
piezometers near the water table, by the equation: for values of ar/b < 0.4 and by the equation: for greater values of ar/b. 5.3.2 Drawdown in an unconfined aquifer is also affected by curvature of the water table or free surface near the control well, and by the decrease in saturated thickness, that causes the transmissivity to decline toward the control well. This test method should be applicable to analysis of tests on water-table aquifers for which the control well is cased to a depth below the pumping level and the drawdown in the control well is less than 0.25.3.3 The transmissivity decreases as a result of decreasing thickness of the unconfined aquifer near the control well. Jacob where s is the observed drawdown and Note 1: 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 D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors. |
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1. Scope | ||||||||||
1.1 This test method covers an analytical solution for determining the horizontal and vertical hydraulic conductivity of an aquifer by analysis of the response of water levels in the aquifer to the discharge from a well that partially penetrates the aquifer. This standard uses data derived from Test Method D4050. 1.2 Limitations—The limitations of the technique for determination of the horizontal and vertical hydraulic conductivity of aquifers are primarily related to the correspondence between the field situation and the simplifying assumption of this test method. 1.3 Units—The values stated in either inch-pound or SI units are to be regarded separately as the standard. The values given in parentheses are for information only. 1.4 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026. 1.4.1 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 or 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 engineering design 1.5 This standard does not purport to address all of the safety problems, 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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2. Referenced Documents | ||||||||||
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