Determination Of Aquifer Parameters Research Articles

Determination of Aquifer Parameters by Using Aqtesolv-software

Several aquifer properties regulate groundwater inflow/outflow to any area, and determination of propertieslike hydraulic conductivity (K), transmissibility and storativity (S) is essential to ascertain the sustainablewell yield. In situ estimation of these properties/parameters is accomplished by conducting pumpingtests. Aquifer parameter tests deliver vital information to resolve regional and local groundwater flowconcerns. In both the confined and unconfined aquifers, there are numerous methods for the determinationof aquifer parameters. In the present research, ten pumping tests were conducted at different geologiclocations in the hardrock region-dominated watershed to estimate aquifer properties. Method “Papadopulos-Cooper (P)” was considered a reference, and “AQTESOLV (Aquifer Test SOLver)” software methods whichinclude (Theis method, Cooper and Jacob (C) method, Neuman (N) method and Tartakovsky-Neuman (T)method) were utilized for the estimation of aquifer properties. Results revealed that T values calculatedusing the P-C method varied from 105.1 square meters per day to 322 square meters per day. However, Tvalues estimated employing AQTESOLV ranged from 122 to 300 square meters per day. All approachesusing the software gave T values that were found to be strongly correlated with the P-C method (Curvematching technique).

Determination of Aquifer Parameters Using Theis Method in Malamawi Island, Isabela City, Basilan, Philippines

The study aims to determine the hydrologic properties of an aquifer of Malamawi Island in terms of transmissivity, storage coefficient, and specific discharge using the Theis method. The study was conducted in March of 2015. The 4 inches 2- boreholes are drilled in two different locations (Diki and Santa Barbara villages) to identify the lithologic properties. A pumping test was performed for forty-five (45) minutes and, drawdowns are observed from the observation well. The shallow aquifer is confined with a transmissivity of 1.70 m2/d, storage coefficient of 0.001012, and specific discharge of 6.53 m2/d.

Determination of aquifer parameters from geosounding data in parts of Afikpo Sub-basin, southeastern Nigeria

Aquifer parameters (e.g. hydraulic conductivity and transmissivity) are routinely determined from pumping tests. Pumping tests are very expensive and researchers have continued to explore cheaper and reliable alternatives to determine these parameters at locations without producing wells. Electrical resistivity method was applied to determine hydraulic conductivity and transmissivity in areas without boreholes in the present study area. Fifteen (15) vertical electrical soundings with a maximum current electrode spacing of 300 m, in the Schlumberger configuration, were acquired. Seven (7) of the soundings were carried out near existing boreholes for comparative analysis between geologic and geoelectric sections. Modelling was done using the IPI2™ software. Cross-plot of hydraulic conductivity (K) obtained from pumping tests and aquifer resistivity (ρ) extracted from sounding interpretations was used to generate a linear relation of the form K = 0.0426ρ + 0.8584. A similar cross-plot between transmissivity (T) and transverse resistance (R) gave another linear relation of the form T = 31.92–0.0019R. These relations, which connects geoelectrical properties with aquifer hydraulic properties, were used to estimate aquifer properties in areas away from well locations. Results show that depth to water ranges from 11.5 m at Mgbom to 52.1 m at Immama Ozizza, while aquifer thickness varies from 14 m at Poperi Primary School, Amasiri (VES 1) to 47.6 m at Immama Ozizza (VES 11). Hydraulic conductivity values range from 1.344 m/day at Mgbom (VES 2) and 2.792 m/day at Okpotokun Primary School Amata-Akpoha (VES 15), with a mean of 2.068 m/day. Transmissivity on the other hand varies between 28.18m2/day at Immama Ozizza (VES 11) and 31.73 m2/day at Mgbom (VES 2) with a mean of 29.96 m2/day. The derived results correlates well with those obtained from pumping test analysis and have provided a cost-effective method for estimating aquifer hydraulic parameters in areas away from well locations.

Closure to “Effective Procedure for Determination of Aquifer Parameters from Late Time-Drawdown Data” by M. Çimen

Closure to “Effective Procedure for Determination of Aquifer Parameters from Late Time-Drawdown Data” by M. Çimen

Discussion of “Effective Procedure for Determination of Aquifer Parameters from Late Time-Drawdown Data” by M. Çimen

Discussion of “Effective Procedure for Determination of Aquifer Parameters from Late Time-Drawdown Data” by M. Çimen

Discussion of “Diagnostic Curve for Confined Aquifer Parameters from Early Drawdowns” by Sushil K. Singh

The determination of aquifer parameters is fundamental to groundwater resources assessment. This important topic has received much attention in the literature over many years. Singh (2008) presented a method for determination of parameters for an ideal confined aquifer, based on early drawdown data. The Theis well function (Theis 1935), the topic of interest here, arises as a core part of the analysis. It is, of course, essential that approximations to the Theis well function be robust and accurate so that reliable estimates of aquifer parameters are obtained. Two approximations for the Theis well function were presented by Singh (2008). The purposes of this discussion were (1) to examine these two approximations, in particular their relative error as reported by the author, and (2) to alert readers to an existing, easy-to-calculate approximation to the Theis well function.

Groundwater exploitation and hydraulic parameter estimation for a Quaternary aquifer in Dar-es-Salaam Tanzania

The fact that groundwater exploitation has largely increased since 1997 in the Dar-es-Salaam aquifer, calls for a directed attention towards possible problems of aquifer overexploitation that may arise in the near future. Hydraulic parameters are important for developing local and regional water plans as well as developing numerical groundwater flow models to predict the future availability of the water resource. The determination of aquifer parameters through pumping tests has become a standard step in the evaluation of groundwater resource potential. The pumping tests in the study area were conducted in August 2004 and August 2005, where 39 boreholes were tested out of 400 visited. In the study area there are over 1300 recorded boreholes drilled by Drilling and Dam Construction Agency (DDCA) by the year 2005. Total groundwater exploitation in the study area was estimated at 8.59 × 10 6 m 3/year, based on yield data collected during the 2004–2005 field campaigns. The pumping tests included single-well tests and tests with measurements on the pumping well and at least one observation well. The tests were conducted for 6 h and 30 min. The pump was shut down after 6 h of pumping and the remaining 30 min were used for recovery measurements. The pumping test analysis methods used include: Neuman type curve matching and Walton type curve matching, checked by specific well capacity assessment and Thiem–Dupuit/Thiem’s method. The curve-matching results from the aquifer tests show the following parameters: an average transmissivity and hydraulic conductivity of 34 m 2/d and 1.58 m/d, respectively for the unconfined aquifer; the semi-confined aquifer has an average value of 63 m 2/d and 2.14 m/d for transmissivity and hydraulic conductivity, respectively. For the case of the storativity, the unconfined aquifer has an average elastic early-time storativity of 0.01, while the lower aquifer has an average storativity of 3 × 10 −4. Specific well capacity method and Thiem–Dupuit/Thiem’s method confirm results for transmissivity and hydraulic conductivity of the semi-confined aquifer, while values for the unconfined aquifer are somewhat larger (by a factor of 2–3). The hydraulic parameters calculated appear to reasonably agree with the geological formation of the aquifers, as deduced from borehole descriptions.

Determination of Aquifer Parameters by Least-Square Method Under Linear Flow Conditions in Fractures-Rocks

Sen' (1986) equation was modified for analysis of constant discharge pumping test-data in selected hydrogeological formation (Phyllite). The results obtained were compared with Sen (1986) graphical method. The least root mean square error was obtained by least-squares method. The advatage of the least squares method is the automatic objecting, which is lacking in the type-curve matching technique

Can Storage Coefficient Be Neglected in the Estimation of Unconfined Aquifer Parameters?

Unlike the Neuman solution (1974), the Dagan solution (1967) neglects elastic storage of unconfined aquifers. Whereas theformer has been commonly used in the analysis of aquifer pumpingtests, application of the latter to determination of aquiferparameters are rare. This article evaluates the reliabilityof the Dagan solution (1967) for the determination of the horizontaland vertical hydraulic conductivity Kr and Kz and specific yieldSy by neglecting the role of aquifer storage coefficient S.To be consistent in the analysis of aquifer test data, the Dagansolution was combined with an inverse computational procedureso that Kr, Kz, and Sy can be automatically calculated. Computationsconverge relatively fast because evaluation of the Dagan solutionis mathematically simpler than is the Neuman solution. Datafrom three pumping tests conducted in alluvial aquifers in thePlatte and Republican River valleys, Nebraska, were analyzed.Earlytime drawdown data from the site in the Platte River valleyare scarce, but plenty of early-time drawdowns were collectedfrom the two sites in the Republican River valley. Comparisonof the results from the Dagan and the Neuman solution indicatesthat the Dagan solution provides aquifer parameter values veryclose to those of the Neuman solution in most situations. Formost practical purposes, the Dagan solution is as good as theNeuman solution for aquifer test analysis.

Determination of aquifer parameters of finite confined aquifers from constant drawdown nonsteady type-curves

A type-curve matching method is presented for the determination of aquifer parameters from water level observations in a finite confined aquifer and discharge measurements at a line sink where there is a constant drawdown. An existing solution in the literature (in the form of complementary error functions) to the one-dimensional nonsteady flow towards a line sink under constant drawdown in a confined aquifer of finite width has been used to define a drain function and to construct a family of type-curves. An application of the method is given.

Determination of aquifer parameters at a ground-water recharge site : Urban, J B; Gburek, W J Ground WaterV26, N1, Jan–Feb 1988, P39–53

Determination of aquifer parameters at a ground-water recharge site : Urban, J B; Gburek, W J Ground WaterV26, N1, Jan–Feb 1988, P39–53

REPLY TO the preceding Discussion by Hund‐Der Yeh of “Determination of Aquifer Parameters by the Slope‐Matching Method”

GroundwaterVolume 24, Issue 6 p. 810-810 REPLY TO the preceding Discussion by Hund-Der Yeh of “Determination of Aquifer Parameters by the Slope-Matching Method” First published: November 1986 https://doi.org/10.1111/j.1745-6584.1986.tb01700.xAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume24, Issue6November 1986Pages 810-810 RelatedInformation

DISCUSSION OF “Determination of Aquifer Parameters by the Slope‐Matching Method,” by Z. Şen

DISCUSSION OF “Determination of Aquifer Parameters by the Slope‐Matching Method,” by Z. Şen

Determination of Aquifer Parameters by the Slope‐Matching Method

ABSTRACTA method has been developed by which the slope between any two successive data points on a time‐drawdown plot can be used for determining aquifer parameters in nonleaky and leaky aquifers. The method yields values of transmissivity and storage coefficient which are in good agreement with the results of the classically known techniques. The method of slope analysis offers several advantages in its use. These advantages include the following: Changes in values for the aquifer parameters that might occur during a pumping test can be identified. Confidence limits can be calculated for average values of aquifer parameters. The method yields meaningful aquifer parameter estimates even for short duration pumping tests. Subjective interpretation of the data is minimized.

DISCUSSION1: “Determination of Aquifer Parameters Using Regression Analysis,” by Irfan A. Khan2

DISCUSSION1: “Determination of Aquifer Parameters Using Regression Analysis,” by Irfan A. Khan2

REPLY TO the preceding Discussion by V. S. Singh, of “Determination of Aquifer Parameters from Large‐Diameter Dug Well Pumping Tests”

GroundwaterVolume 20, Issue 5 p. 616-617 REPLY TO the preceding Discussion by V. S. Singh, of “Determination of Aquifer Parameters from Large-Diameter Dug Well Pumping Tests” R. Herbert, R. HerbertSearch for more papers by this author R. Herbert, R. HerbertSearch for more papers by this author First published: September 1982 https://doi.org/10.1111/j.1745-6584.1982.tb01380.xAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume20, Issue5September 1982Pages 616-617 RelatedInformation

DISCUSSION OF “Determination of Aquifer Parameters from Large‐Diameter Dug Well Pumping Tests,” by R. Herbert and R. Kitching, November‐December 1981 issue, v. 19, no. 6, pp. 593–599

DISCUSSION OF “Determination of Aquifer Parameters from Large‐Diameter Dug Well Pumping Tests,” by R. Herbert and R. Kitching, November‐December 1981 issue, v. 19, no. 6, pp. 593–599

Determination of Aquifer Parameters from Large‐Diameter Dug Well Pumping Tests

ABSTRACTLarge‐diameter dug wells are the main source of water supply in many areas of the world. They are particularly useful in shallow aquifers with a low transmissivity. Existing methods for determining the transmissivity of aquifers from pumping tests carried out in dug wells were found wanting. This paper describes two new methods that can be used to determine the transmissivity of the aquifer from dug well tests. Examples of the application of the methods are given.

Determination of Aquifer Parameters from Step Tests and Intermittent Pumping Data

ABSTRACTThe expression image is a handy tool for predicting aquifer parameters using all the drawdown and recovery data obtained during step‐drawdown tests or periods of cyclic or intermittent pumping.For inefficient wells the expression image fits pumping wells better. The data from conventional step‐drawdown tests of pumping wells can be used to obtain T, C, and y. If the data fail to fit the ideal, they may be used to interpret local hydrologic conditions.

Determination of aquifer parameters by a two-well pulsed method using radioactive tracers — Reply

Abstract A pilot investigation of the behaviour of water in a series of boreholes in the Chalk aquifer using 82Br as tracer is described. The method consists of an instantaneous injection of the tracer into one borehole and subsequent measurement of the tracer concentration in the water abstracted from a neighbouring borehole as a function of time. This paper presents the field data, the results of the data analysis using a simple statistical model to describe the shape of the observed pulse and proposals for the future work deemed necessary to provide hydrological information about the behaviour of groundwater in the Chalk using a two-well pulsed method.