Overdamped slug tests typically occur in aquifers of low to moderate hydraulic conductivity k and exhibit the type of response depicted in figure 2. The attendees will then conduct pneumatic slug tests in the field on the university of connecticut campus in wells that exhibit nonoscillatory overdamped and oscillatory underdamped responses. Test data from three wells exhibited fast, underdamped waterlevel responses and were analyzed. For underdamped responses, the user selects the damping parameter cd and modulates the data to obtain the best fit curve. A general nonlinear model based on the navierstokes equation, nonlinear frictional loss, nondarcian flow, acceleration effects, radius changes in the wellbore, and a hvorslev model for the aquifer has. Hydrogeological analysis of slug tests in glacier boreholes. Choose from solutions for confined, leaky and fractured aquifers. Pumping tests constant rate, variable rate, stepdrawdown and recovery slug tests both overdamped and underdamped responses. Most slug tests are carried out as singlewell tests, i. The design, performance, and analysis of slug tests. Slug tests in unconfined aquifers scholarworks at wmu. The waterlevel response displacement from a slug test can be classified as either overdamped or underdamped. A slug test involves the instantaneous injection or withdrawal of a volume or slug of water or solid cylinder of known volume. Aqtesolv is the most advanced software for slug test analysis and features the most.
These solutions allow you to analyze data with underdamped and overdamped response and include a correction for frictional well loss in smalldiameter wells. Aqtesolv slug tests includes solutions by butler 1998, springergelhar 1991 and butlerzhan 2004 for the analysis of slug tests with oscillatory response due to inertial effects. In an underdamped test, the response is oscillatory figure 4 and requires specialized methods for analysis, e. The behaviour of oscillating systems is often of interest in a diverse range of disciplines that include control engineering, chemical engineering, mechanical. Overdamped slug tests aquifer testing 101 aqtesolv. This easytouse and intuitive software promotes rapid and accurate determination. The slug test acquisition software included with the gw1600 kit is loaded on a portable computer and used to observe and acquire slug test data in the field. This research presents a hydraulic conductivity k analysis of unconfined aquifers using slug tests. Abstract an analytical solution is presented for the slug tests conducted in a partially penetrating well in an unconfined aquifer affected from. Choose aqtesolv to get the most advanced software for slug test analysis including methods for single and multiwell tests, overdamped and underdamped conditions, wells screened across the water table, and more aqtesolv is the most advanced software for slug test analysis and features the most comprehensive set of solution methods for overdamped.
Hydraulic conductivity is estimated by fitting a straight line to normalized displacements on a logarithmic axis vs. Aqtesolv includes the butler solution for analyzing underdamped slug tests in. The first use of zero storage models for underdamped slug test analysis was presented by springer and gelhar 1991 using data collected from an unconfined sand and gravel aquifer at the u. Underdamped test response patterns are exhibited within stress wells where.
Its an informal name given to a story during the production process. The slug test analysis sta software is a simple, userfriendly software package designed for use with slug test data obtained with the geoprobe systems gw1600 pneumatic slug test kit. Slug test configuration for a partially penetrating well in a confined aquifer. Kgsofr 200026analyzing slug tests for maximum accuracy. The damping ratio is a system parameter, denoted by.
Partially penetrating b 100 ft h 50 ft l 15 ft r c 0. Astm d4044 d4044m 15 standard test method for field. Raw timewater level series are entered with mutiple slugs from a single well. Analysis of slugtests with highfrequency oscillations. Software for slug test analysis such as aqtesolv allows you to toggle. By measuring and recording the rate of return to static conditions recovery, one is able to estimate the local horizontal hydraulic conductivity of the material surrounding the well. The procedure involves either adding or removi ng a measured quantity of water from a well rapidly, followed by making a rapid series of waterlevel measurements to assess the rate of waterlevel. Conduct type curve fitting for underdamped aquifer response. Super slug provides a draganddrop implementation of the cooper, bredehoeft, papadopulos type curve method. Typical control well configuration for slug test in unconfined aquifer with fully submerged well screen. Improved curve fitting methods for underdamped slug tests.
Data from a typical underdamped slug test in a highk confined aquifer with fully submerged well screen. Dynamic interpretation of slug tests in highly permeable aquifers. Data analysis exercises include both simple and advanced pumping and slug test analyses to match the range of conditions typically encountered during field investigations. Aquifertest is an easytouse software package for analyzing, interpreting and visualizing pumping and slug test data. Fit head vs time data to model to solve for c d methods to solve for c d curve matching, match to type curves least squares minimize sum of the square differences, e. The solution is appropriate for the conditions shown in the following figure. For example, as stated earlier, a submersible pressure transducer is commonly used for the indirect measurement of the water level response during a slug test. Learn more waterloo hydrogeologic is located at 219 labrador dr. R radius measured from centre of well to undisturbed. Slug test responses can run the gamut from overdamped to underdamped. This report documents several spreadsheets that have been developed for the analysis of aquiferpumping test and slug test data.
Slug tests frequently are analyzed with bouwer and rice to estimate hydraulic conductivities. It c onsists in inducing an abrupt change in water level in a well and monito ring the subsequent water level recovery. Pdf analysis of slug tests in formations of high hydraulic. As the story winds its path from the beat reporter assuming these even exist any more. Usually, test data are fitted visually to theoretical solutions. This is the only slug test analysis method that will provide an estimate of aquifer storativity. Transmissivity and storage coefficient estimates from slug. It is a method used by hydrogeologists and civil engineers to determine the transmissivityhydraulic conductivity and storativity of the material the well is completed in. Slugtesting is the quickest and most costeffective way of characterizing aquifer characteristics, and this book straightforwardly and concisely discusses the theory, performance, and analysis of the test methods most commonly used today. Underdamped response may occur in aquifers of high hydraulic conductivity.
With the slug test the hydraulic conductivity or transmissibility of an aquifer is determined from the rate of rise of the water level in a well after a certain volume or slug of water is suddenly removed from the well. However, slug tests reflect conditions near the well, therefore are influenced by nearwell conditions, such as gravel pack, poor well development, and skin. Slug test analysis software aqtesolv is the most comprehensive slug test software for overdamped to underdamped rising head or falling head tests in. Until recently models were readily available for only the two extremes. This approach works well for overdamped responses where water levels monotonically return to initial conditions.
In our program of mlsts, linear behavior was consistently. Slug test responses are analyzed with kgs solution which ranges from underdamped to. The slug test analysis sta software is a simple, userfriendly software package designed for. Time to reach first peak undamped or underdamped only. Aquifer transmissivity t and storage coefficient s values for most wells were estimated from slugtest data using the cooperbredehoeftpapadopulos method. The bouwerrice slug test is designed to estimate the hydraulic conductivity of an aquifer. Slug test method measurement of hydraulic conductivity.
The slug test method is one of a number of different methods that are used to evaluate the permeability or hydraulic conductivity of an aquifer. Pdf a new procedure is presented for the analysis of slug tests. Super slug slug test analysis software bouwer and rice automatic. Butler 1998 slug test solution for highk confined aquifers. Spreadsheets for the analysis of aquifertest and slug. A slug test yielding an oscillating water level response is called underdamped. Underdamped slug test model solutions how is k determined. Underdamped second order systems underdamped case results in complex numbers this generates a decaying oscillating case. Some of the key features found in aqtesolv include the following. Introduction slug testing is a common field method for estimating aquifer permeability. Slug periods are identified and selected, normalized responses are plotted en masse.
Consider a case of the rlc circuit below assume the capacitor is initially charged to 10 v what happens is cs voltage is creates current that current transfers energy in. Analysis of underdamped slug test in smalldiameter well with frictional well loss in a highk aquifer butler 2002. Slug tests are used to determine in situ aquifer hydraulic conductivity more quickly and economically than by a pump test. Bouwerrice developed an equation for hydraulic conductivity as follows. The slug test is simpler and quicker than the theis pumping test because observation wells and pumping the well are not. Advance aquifer testing techniques featuring aqtesolv. Astm d4044 96 standard test method for field procedure. This report documents several spreadsheets that have been developed for the analysis of aquiferpumping test and slugtest data. For ease in referencing results for the ou zp1 field testing program within the.
This is of special importance when testing a potentially contaminated aquifer. The slug test analysis software is a graphical interface used to model the data collected from a slug test conducted in direct push tools or conventional monitoring wells that provide either an over damped or underdamped response. The term slug comes from the world of newspaper production. The solutions for slug tests apply to the analysis of singlewell underdamped and overdamped slug test in unconfined and confined aquifers. Dynamic interpretation of slug tests in highly permeable. Hvorslev 1951 solution for a slug test in an unconfined aquifer404 dagan 1978 solution for a slug test in an unconfined aquifer406 hyder et al. A slug test for determining hydraulic conductivity of. Slug tests are used in groundwater hydrology to determine the hydraulic. Insights from unsteady flow analysis of underdamped slug tests in. Choose aqtesolv to get the most advanced software for slug test analysis including methods for single and multiwell tests, overdamped and underdamped conditions, wells screened across the water table, and more. Analysis of slug test data exhibiting double straightline effect in well screened across the water table using bouwer and rice 1976 method. Data from more than 100 slug tests, including tests for low permeability glacial tills and fractured rock deposits, coarsegrained sand deposits, and simulated tests were analyzed. Slug tests were conducted on 56 observation wells open to bedrock at the former naval air warfare center nawc in west trenton, new jersey. Pdf analysis of wellaquifer response to a slug test.
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