Understanding diagnostic plots for well-test interpretation

Renard, Philippe; Glenz, Damian; Mejı́as, Miguel Bruno

doi:10.1007/s10040-008-0392-0

Cited by 142 publications

(125 citation statements)

References 32 publications

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“…Pumping durations lasted between 72 and 120 h and pumping yields ranged between 1.3 and 9.4 m 3 /h. Pumping tests were interpreted by Vouillamoz et al (2012a) using analytical solutions and drawdown log-derivative analysis (Renard et al 2009) implemented in AQTESOLV/Pro v4.5 software.…”

Section: Estimation and Supplementation Of Aquifer Productivity And Smentioning

confidence: 99%

Can groundwater secure drinking-water supply and supplementary irrigation in new settlements of North-West Cambodia?

Vouillamoz

Valois²,

Lun

et al. 2015

Hydrogeol J

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Since the end of the Cambodian Civil War in 1998, the population of the Oddar Meanchey province has drastically increased despite the lack of adequate infrastructure, including basic amenities such as drinking-water supply. To improve the access to drinking water, governmental and aid agencies have focussed on drilling shallow boreholes. The use of groundwater for irrigation is also a growing concern to cope with the occasional late arrival of the rainy season or to produce food during the dry season. Since the groundwater resource in the province has not been documented, a 4-year study was undertaken (2011)(2012)(2013)(2014), aiming to estimate the capability of groundwater to supply domestic needs and supplementary irrigation for rice production. Aquifer properties were estimated by combined use of hydrogeological techniques with the geophysical magnetic resonance sounding method. Groundwater storage and recharge were estimated based on new developments in the application of the geophysical method for quantifying specific yield. The median groundwater storage of the targeted sandstone aquifer is 173 mm, the recharge is diffuse and annually ranges from 10 to 70 mm, and the transmissivity is low to medium.Simulations of pumping indicate that the aquifer can easily supply 100 L of drinking water per capita daily, even considering the estimated population in 2030. However, the shallow aquifer can generally not deliver enough water to irrigate paddy fields of several hectares during a 2-month delay in the onset of the monsoon.

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Section: Estimation and Supplementation Of Aquifer Productivity And Smentioning

confidence: 99%

Can groundwater secure drinking-water supply and supplementary irrigation in new settlements of North-West Cambodia?

Vouillamoz

Valois²,

Lun

et al. 2015

Hydrogeol J

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“…A pumping test induces a perturbation to an aquifer by pumping from a well, while at the same time measuring aquifer responses in the form of head variations (Renard et al, 2009). Selection of appropriate analytical and numerical models is a key part of calculating the hydraulic characteristics, such as hydraulic conductivity, transmissibility, and storage coefficient, of the aquifer (Renard et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Selection of appropriate analytical and numerical models is a key part of calculating the hydraulic characteristics, such as hydraulic conductivity, transmissibility, and storage coefficient, of the aquifer (Renard et al, 2009). Hydrodynamic coefficients of aquifers in water resource studies vary of many orders of magnitude, and small errors in the calculation of these coefficients can produce errors of several orders of magnitude in budgets and numerical models of groundwater.…”

Section: Introductionmentioning

confidence: 99%

“…A conceptual model for interpretation of the pumping test data is selected based on the diagnostic plot technique combined with knowledge of the local geology (Samani et al, 2006;Renard et al, 2009;Hammond and Field, 2014). The major advantage of diagnostic plots is that they provide a unified procedure to interpret pumping test data (Renard et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of the results of pumping and tracer tests in a karst terrain

Nassimi¹,

Mohammadi²

2016

JCKS

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Pumping and tracer tests are commonly used to measure aquifer parameters such as hydraulic conductivity. Hydraulic conductivity is, however, difficult to characterize; especially in heterogeneous karst terrain. In this research, results of pumping and tracer tests are combined to determine hydraulic conductivities of the karst terrain at the Salman Farsi Dam Site. Pumping test data were analyzed by dual-porosity analytical models. The tracer tests were used to determine seepage velocities based on the assumption of Darcy's law, with calculated Reynolds numbers consistent with laminar flow. Geometric means of the hydraulic conductivities calculated from tracer tests were consistently higher than results derived from pumping tests. Movement of injected dye in a natural groundwater flow system is strongly controlled by preferential flow paths; therefore the estimated hydraulic conductivity is mainly affected by major dissolution openings. However, estimated hydraulic conductivity based on the pumping-test data is representative of the average hydraulic conductivity. In addition, Lugeon (or packer) tests were used to delineate the distribution of hydraulic conductivity within three boreholes.

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“…In addition to the analytical solution, hytool contains a set of functions to help the user load and manipulate the hydraulic test data, construct diagnostic plots (P. Renard, Glenz, and Mejias 2009), fit automatically a model, and report the results as illustrated in the following figure. In this example, a data set (measurements of groundwater drawdown as a function of time during a constant rate pumping experiment) is interpreted using the Theis analytical model.…”

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confidence: 99%

Hytool: an open source matlab toolbox for the interpretation of hydraulic tests using analytical solutions

Renard¹

2017

JOSS

Self Cite

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SummaryHydraulic tests are hydrogeological field experiments used to identify aquifer types and physical parameters. They consist of applying a hydraulic perturbation such as pumping groundwater in a well and observing the variations of the groundwater levels in the same well or in other observation wells. Many types of tests, involving different types of hydraulic perturbations, and many analytical solutions, have been developed in the past to interpret such experiments (Raghavan 1993) (P. Renard 2006).Hytool is a Matlab toolbox that provides a catalog of classical analytical solutions for interpreting hydraulic tests. It includes models corresponding to different flow conditions and aquifer types (confined aquifers, unconfined aquifers, double-porosity media, general radial flow, single fracture, fractal media). Some solutions for multiple pumping rates, constant head test, or slug tests are available as well as bounded aquifers.The structure of the code is modular and allows a user to easily add new solutions when needed. Often the solutions are expressed as dimensionless equations in the Laplace domain. Therefore, the code structure includes an implementation of the Stefhest (Stehfest 1970) and de Hoog techniques to invert numerically the Laplace transform.In addition to the analytical solution, hytool contains a set of functions to help the user load and manipulate the hydraulic test data, construct diagnostic plots (P. Renard, Glenz, and Mejias 2009), fit automatically a model, and report the results as illustrated in the following figure. In this example, a data set (measurements of groundwater drawdown as a function of time during a constant rate pumping experiment) is interpreted using the Theis analytical model. The graph shows the superposition of the data and the model and includes the logarithmic derivative of the data and model. Below the graph, hytool provides information about the parameters that were obtained by the least-square procedure, the quality of the fit and the values of the hydraulic properties of the aquifer (transmissivity and specific storage).The user documentation is included within the toolbox and available as internal help within Matlab. The help contains a description of each individual function plus a series of examples including data sets that are used to demonstrate how hytool can be used in practice.Hytool is employed for teaching purposes in the University of Neuchâtel. It is also used in several research projects for determining the hydraulic properties of porous or fractured (Mejías, Renard, and Glenz 2009) aquifers. This often constitutes a preliminary step for many hydrogeological applications. Hytool was for example used in the context of estimating groundwater inflows in tunnels (Dematteis et al. 2003) or groundwater modeling study (Alcolea et al. 2009). Recently, Hytool was used in a research project devoted to the development of a new geophysical monitoring method (DesRoches and Butler 2016).Renard, (2017). Hytool: an open source matlab toolbox for the interpretati...

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Understanding diagnostic plots for well-test interpretation

Cited by 142 publications

References 32 publications

Can groundwater secure drinking-water supply and supplementary irrigation in new settlements of North-West Cambodia?

Can groundwater secure drinking-water supply and supplementary irrigation in new settlements of North-West Cambodia?

Comparison of the results of pumping and tracer tests in a karst terrain

Hytool: an open source matlab toolbox for the interpretation of hydraulic tests using analytical solutions

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