![]() ![]() Analysis of step-drawdown test with recovery assuming a leaky confined aquifer (data from Clark 1977). We call this programme the FC Programme (Flow Characteristic Programme), and methods include the following: the Derivative Method the Barker Fractal method and. Methods for step-drawdown tests in the literature typically assume nonleaky confined conditions however, as shown by Bear (1979), most constant-rate pumping test solutions may be adapted for the analysis of linear and nonlinear well loss associated with step-drawdown tests.ĪQTESOLV gives you a choice of models beyond nonleaky confined conditions for greater flexibility in your analysis of step-drawdown tests.įor example, AQTESOLV adapts the solution by Hantush and Jacob (1955) for the analysis of step-drawdown tests in leaky confined aquifers (Figure 1). This video is part of: Spreadsheets for solving Groundwater Flow and Pollution Problems. Other products limit step-drawdown test analysis to fully penetrating line-source wells in nonleaky confined aquifers.ĪQTESOLV expands your options for step-drawdown tests to include solutions for leaky confined aquifers with options for partially penetrating wells and wellbore storage. 1.06K subscribers This spreadsheet automatically fit the Theis equation to a pumping test. The distance-drawdown method is an equilibrium or steady-state method, thus storage cannot be estimated.AQTESOLV has more features for the interpretation of step-drawdown tests than competing software. ![]() Multi-well test spreadsheets included in this report are Hantush-Jacob Leaky Aquifer Method and Distance-Drawdown Methods. Single-well tests include all slug tests (Bouwer and Rice Method, Cooper, Bredehoeft, Papadopulos Method, and van der Kamp Method), the Cooper-Jacob straight-line Method, Theis recovery-data analysis, Jacob-Lohman method for flowing wells in a confined aquifer, and the step-drawdown test. In backtesting, it shows you the downside risk of a strategy. Additionally, single-well tests are not sensitive to aquifer-storage properties. By Hugh Kimura Maximum drawdown is an important trading statistic to track in your backtesting and live trading. A step drawdown test is a pumping test in which the drawdown in a well is observed while the discharge rate from the well is increased in steps. The derivations of the analytical solutions were previously published. Each spreadsheet incorporates analytical solution(s) of the partial differential equation for ground-water flow to a well for a specific type of condition or aquifer. Using Excel for Aquifer Test Introduction Creating a Scroll Bar. Several spreadsheets have been developed for the analysis of aquifer-test and slug-test data. 26, 2018, 1 d prior to the constant-rate test, to deter- mine an appropriate pumping rate. The test will usually commence with a step drawdown test to determine the flow rate for the. A step-drawdown test was performed on March. Entering data into excel, Estimation of well efficiency, Estimation of borehole sustainable yield, and. The following steps outline how to calculate maximum drawdown in Excel: Create a new. This data is captured in Excel format and can often be. Session One: Processing and analysis of the data. Measurement of the recovery (at least 95) Day 3. A step-drawdown test (or step test) is a single-well pumping test designed to investigate the performance of a pumping well under controlled variable. These non-ideal effects frequently cause estimates of storage to be erroneous by orders of magnitude. Evaluate the step draw-down test data to determine the pumping rate for the constant discharge test Session Three: Field Practical. The extrapolated drawdown is calculated at the end of the dry season, and the specific drawdown used to recommend pump installation depths. Estimation of storage properties from single-well tests is generally discouraged because single-well tests are affected by wellbore storage and by well construction. GeoVES XL V1.3 (16.11.03) Hand Pump XL is a spreadsheet for interpreting short term pumping and recovery tests carried out in low yielding boreholes destined for the installation of hand pumps. Storage properties should not be estimated with many of the spreadsheets because most are for analyzing single-well tests. These spreadsheets were written in Microsoft Excel 9.0 (use of trade names does not constitute endorsement by the USGS). Thus, this report abbreviates the theoretical discussion, but includes practical information about each method and the important assumptions for the applications of each method. Use a computer program or excel spreadsheet AQTESOLV, Aquifer Test Water Resources Management Division Department of Environment & Conservation. ![]() Each spreadsheet incorporates analytical solution(s) of the partial differential equation for ground-water flow to a well for a specific type of condition or aquifer. Step Drawdown Tests Single well test where well is pumped at a low constant discharge rate until drawdown stabilizes. Several spreadsheets have been developed for the analysis of aquifer-test and slug-test data. ![]()
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