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Vol. 10  No. 1

ANALYZING PUMP & SLUG TEST DATA USING AQUIFERwin32

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Aquiferwin32 is the most sophisticated software system for analysis and display of aquifer test results. Aquiferwin32 combines powerful data management capabilities with everything you would expect in a Windows program. Aquiferwin32 has been chosen by the Environment Agency in England and has become the software choice for groundwater scientists and engineers requiring cost effective and versatile analysis tools.

In this newsletter we will briefly discuss the steps necessary in analyzing pump and slug test using Aquiferwin32. We will first mention all of the analysis types available in Aquiferwin32, followed by a description of how to set up a simple problem. Further discussion into some of the more advanced features will follow.

Analysis Types

Slug Test Analyses

  • Hvorslev, 1951 - Time Lag and Soil Permeability in Ground-Water Observations
  • Bouwer & Rice, 1976 - Slug test for determining hydraulic conductivity of unconfined aquifers with completely or partially penetrating wells
  • Black, 1978 - The use of the slug test in groundwater investigations (Modified Bouwer & Rice unconfined aquifer slug test analysis using an exponential type curve)
  • Cooper, Bredehoeft & Papadopulos, 1967 - Response of a Finite-Diameter Well to an Instantaneous Charge of Water
  • KGS Model - Slug test analysis for partially penetrating wells in confined or unconfined aquifers; Hyder, Butler, McElwee, and Liu, 1994 and Butler, 1998
  • Kipp, 1985 -Type Curve Analysis of Inertial Effects in the Response of a Well to a Slug Test

Pumping Test Analyses

  • Cooper and Jacob, 1946 - A generalized graphical method for evaluating formation constants and summarizing well field history. (Cooper Jacob Straight Line Method)
  • Theis, 1935 - Constant discharge from a fully penetrating well in a nonleaky aquifer*
  • Theis, 1935 (Unconfined) - Constant discharge from a fully penetrating well in a nonleaky aquifer*
  • Theis, 1946 (Recovery) - Recovery test after constant discharge from a fully penetrating well in a nonleaky aquifer
  • Hantush, 1961 - Constant discharge from a partially penetrating well in a nonleaky aquifer
  • Papadopulos and Cooper, 1967 - Constant discharge from a fully penetrating penetrating well of finite diameter in a nonleaky aquifer
  • Hantush, 1960 - Constant discharge from a well in a leaky aquifer with storage of water in the confining beds
  • Hantush and Jacob, 1955 - Constant discharge from a fully penetrating well in a leaky aquifer*
  • Hantush, 1964 - Constant discharge from a partially penetrating well in a leaky aquifer*
  • Neuman, 1972 - Theory of flow in unconfined aquifers considering delayed response of the water table
  • Neuman, 1974 - Effects of partial penetration on flow in unconfined aquifers considering delayed aquifer response*
  • Moench, 1984 - Double-Porosity Models for a Fissured Groundwater Reservoir with Fracture Skin
  • Moench, 1985 - Transient Flow to a large-Diameter Well in an Aquifer with Storative Semiconfining Layers
  • Moench, 1997 - Flow to a well of finite diameter in a homogeneous, anisotropic water table aquifer

Step Test Analyses

  • Eden & Hazel, 1973 - Step-drawdown test analysis for fully penetrating well in a confined aquifer. Determines well losses and aquifer transmissivity.
  • Birsoy and Summers, 1980 - Variable or intermittent discharge rate analysis for well in a confined aquifer. Determination of aquifer transmissivity and storage.

Model Solutions

  • Theis, 1935 - Constant discharge from a fully penetrating well in a nonleaky aquifer
  • Hantush, 1960 - Constant discharge from a well in a leaky aquifer with storage of water in the confining beds
  • Hantush and Jacob, 1955 - Constant discharge from a fully penetrating well in a leaky aquifer
  • Neuman, 1972 - Theory of flow in unconfined aquifers considering delayed response of the water table
  • WinFlow - Analytic element flow model developed by ESI (Modeling version only)
  • WinTran - Analytic element flow and Finite element contaminant transport model developed by ESI (Modeling version only)

Setting Up a Problem

  • The first step in setting up a problem in Aquiferwin32 is entering your data. Aquiferwin32 can import data from any Windows spreadsheet, like Excel, via the clipboard. In addition, data can be entered manually.

  • You all need to set the units being used for your analysis. This is done in Edit/Units.

  • You can choose analysis type in Edit/Solution; default is Theis (1935) for confined aquifers.

  • Enter the pumping data under Edit/Aquifer Test in the Pumping tab.

  • Analyze the test using one of two matching methods: manual or with the non-linear least squares statistical match.

  • For manual matching the curve can be moved using the cursor arrows, to present a better match to the type curve.

  • For non-linear least squares statistical match, the calculator button simply needs to be clicked on.

  • You can then modify the graph in Edit/Graph to change the graph title, size location, axis size and annotation, etc.

Weighting Data

When analyzing most aquifer and slug tests, it is assumed that late time data is more representative of the subsurface conditions. To accommodate this, Aquiferwin32 provides a variable weighting factor which allows the  curve match to rely upon the more heavily weighted data more than the lightly weighted data.

To change the weight of the data, go to Edit/AquiferTest, under the Well Data tab.  The default value for all data is 1.0.

Analyzing Other Data

You can also analyze recovery tests, variably pumping tests, and simultaneous pump and recovery tests. To analyze recovery tests, under Edit/Solution, choose a recovery method, and under Parameters, enter what time the recovery starts. Forgetting to enter the time when recovery starts is the most common mistake in recovery test analysis.

For variable pumping, you can analyze pumping and recovery data at the same time. This is simply done by turning the pump off at a specified time in the pump data (Edit/Aquifer Test; pumping tab).

Overall, Aquiferwin32 provides a quick, easy and dependable method of analyzing pump test, or slug test data. More information, and tutorials, are provided in the Aquiferwin32 manual.

For more info or to purchase AquiferWin32 click here: AquiferWin32



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