Results 181 to 190 of about 8,442,772 (211)

Rapid Solution of the Nonlinear Step-Drawdown Equation

Ground Water, 1983
The step-drawdown test is frequently utilized by hydrogeologists as an aid in assessing well efficiency and approximate pumping capacity. Unfortunately, the analysis of step-drawdown data presently requires either a solution to a system of highly ...
Cass T. Miller, Walter J Weber
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Analysing step-drawdown tests in heterogeneous aquifers

Quarterly Journal of Engineering Geology and Hydrogeology, 2002
All existing methods for analysing step-drawdown test data assume that the aquifer is homogeneous, whereas most real aquifers are heterogeneous. Failure to account for such heterogeneity can lead to erroneous mis-interpretation of step-drawdown test results, which may in turn result in expensive over- or under-design of long-term pumping plant.
Karami GH, Younger PL
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Meaningful Interpretation of Step‐Drawdown Tests

Groundwater, 1995
Abstract From a critical review of literature it is concluded that the available methods of analyzing step‐drawdown tests produce information which can be misleading, inaccurate, or meaningless. Calculation of the total well loss from step‐drawdown tests, on the other hand, provides a meaningful evaluation of well performance but is ...
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New Insight Into The Step-Drawdown Test In Fractured-Rock Aquifers

Hydrogeology Journal, 1994
Review of the historical development of the step-drawdown pumping test and interpretations of well test data using the step-drawdown method indicates considerable differences in the importance attributed to head losses in the artificial environment (e.g., the gravel pack and screen) in the immediate vicinity of the wellbore and the losses resulting ...
Lee C. Atkinson, John E. Gale, Collin R. Dudgeon   +2 more
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Analysis and Application of Step-Drawdown Test

Journal of the Hydraulics Division, 1966
A review of the theory behind the step-drawdown test shows that the analytical method developed by Rorabaugh should be routinely used to discriminate among various types of flow and to determine more accurately flow parameters. The usual analysis for one selected time after the beginning of each step should be supplemented by a consideration of test ...
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Discussion on ‘The analysis and planning of step drawdown tests’ by L. Clark

Quarterly Journal of Engineering Geology, 1978
May I congratulate Lewis Clark on his paper covering the analysis and planning of step drawdown tests. I think the subject of well performance is due for a ‘shake-up’ and this paper will hopefully initiate some useful scientific discussion in the right direction. I have two main criticisms to make.
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EDNHAZ: a program for analyzing step drawdown tests

Computers & Geosciences, 1989
Abstract This paper presents a FORTRAN program for analyzing step drawdown tests which has some advantages over traditional graphically based methods. A more flexible approach to the planning and execution of stepped pumping tests is possible by using the method of analysis adopted in the program and outlined in the text.
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The analysis and planning of step drawdown tests: a clarification

Quarterly Journal of Engineering Geology, 1979
I have received letters from Mr D. M. Milne and Dr P. F. Worthington pointing out an error in the application of the analytical methods in this paper, (published in 1977 in Q. Jl Engng Geol . 12 , 125–143). I would therefore like to take this opportunity to clarify the matter.
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Step‐Drawdown Test Needs Critical Review ^a

Groundwater, 1969
Abstract A review of the literature and a study of a number of field tests shows that the presently used analysis and interpretation of step‐drawdown tests can be misleading. The efficiency of a well is defined. The usefulness of the step‐drawdown test is outlined and a hypothesis for reduction in specific capacity is offered.
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Evaluation of Traditional and Nontraditional Optimization Techniques for Determining Well Parameters from Step-Drawdown Test Data

Journal of Hydrologic Engineering, 2006
Adequate knowledge of the hydraulic characteristics of production wells is indispensable for the proper development and management of wells and for the selection of suitable pumps. In this study, the characteristic hydraulic parameters of production wells were determined by the widely used graphical analysis of step-drawdown pumping test data as well ...
Madan K. Jha, Abhilekh Kumar, G. Nanda, G. Bhatt   +3 more
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