DERIV: A Computer Program for Calculating Pressure Derivatives for Use in Hydraulic Test Analysis

Spane, F.A.; Wurstner, S.K.

doi:10.1111/j.1745-6584.1993.tb00855.x

Cited by 83 publications

(87 citation statements)

References 16 publications

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“…Bourdet et al (1989), Spane and Wurstner (1993), Horne (1995), or Veneruso and Spath (2006) discuss and present different techniques such as smoothing the data prior to the computation of the derivative, or smoothing the derivative.…”

Section: Noise In the Derivativementioning

confidence: 99%

“…Therefore, even if the concept has already been introduced and described in hydrogeological journals (e.g. Spane and Wurstner 1993), only a minority of hydrogeologists are using diagnostic plots and the technique is not taught in specialized hydrogeology textbooks. This is why there is still a need to promote the use of this technique in hydrogeology to reach a large part of the profession by explaining how the technique works and how it can be used in practice.…”

Section: Introductionmentioning

confidence: 99%

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Understanding diagnostic plots for well-test interpretation

2008

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In well-test analysis, a diagnostic plot is a scatter plot of both drawdown and its logarithmic derivative versus time. It is usually plotted in log-log scale. The main advantages and limitations of the method are reviewed with the help of three hydrogeological field examples. Guidelines are provided for the selection of an appropriate conceptual model from a qualitative analysis of the log-derivative. It is shown how the noise on the drawdown measurements is amplified by the calculation of the derivative and it is proposed to sample the signal in order to minimize this effect. When the discharge rates are varying, or when recovery data have to be interpreted, the diagnostic plot can be used, provided that the data are preprocessed by a deconvolution technique. The effect of time shift errors is also discussed. All these examples show that diagnostic plots have some limitations but they are extremely helpful because they provide a unified approach for well-test interpretation and are applicable in a wide range of situations.

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Section: Noise In the Derivativementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Understanding diagnostic plots for well-test interpretation

2008

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“…The derivative of the corrected water level with respect to the natural logarithm of time (i.e., essentially the slope of the semi-log plot) is calculated and plotted on the log-log plots of drawdown versus time. The use of derivative plots has been shown to significantly improve the diagnostic and quantitative analysis of various hydrologic test methods (Bourdet et al 1989, Spane andWurstner 1993). The improvement in test analysis is attributed to the sensitivity of pressure derivatives to various test/formation conditions.…”

Section: Diagnostic Analysis and Derivative Plotsmentioning

confidence: 99%

“…Constant-head boundaries display a downward trend in the derivative, which may be preceded by a stable derivative if radial flow conditions occur before the boundary effect becomes dominant. The DERIV program, described in Spane and Wurstner (1993), should be employed for diagnostic and test-analysis aspects for drawdown data obtained during large-scale, constant-rate, pumping tests conducted within the 200-ZP-1 operational system.…”

Section: Diagnostic Analysis and Derivative Plotsmentioning

confidence: 99%

Large-Scale Pumping Test Recommendations for the 200-ZP-1 Operable Unit

Spane

2010

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SummaryCH2M Hill Plateau Remediation Company (CHPRC) is currently assessing aquifer characterization needs to optimize pump-and-treat remedial strategies (e.g., extraction well pumping rates, pumping schedule/design) in the 200-ZP-1 operable unit (OU), and in particular for the immediate area of the 241-TX-TY Tank Farm. Specifically, CHPRC is focusing on hydrologic characterization opportunities that may be available for newly constructed and planned ZP-1 extraction wells. These new extraction wells will be used to further refine the 3-dimensional subsurface contaminant distribution within this area and will be used in concert with other existing pump-and-treat wells to remediate the existing carbon tetrachloride contaminant plume. Currently, 14 extraction wells are actively used in the Interim Record of Decision ZP-1 pump-and-treat system for the purpose of remediating the existing carbon tetrachloride contamination in groundwater within this general area. As many as 20 new extraction wells and 17 injection wells may be installed to support final pump-and-treat operations within the OU area.The addition of new, high-pumping capacity, extraction wells to the 200-ZP-1 pump-and-treat system provides the opportunity of generating areal hydrologic responses that may be analyzed for determining large-scale information for a wide-range of hydrologic properties (i.e., transmissivity, hydraulic conductivity, vertical and horizontal anisotropy, and storativity). This type of aquifer test characterization information is important for the detailed modeling of contaminant capture and the optimal use of the pump-and-treat system. Large-scale information can be obtained that is more reflective of ZP-1 pumpand-treat system operations by performing a constant-rate pumping test of longer duration (e.g., ~1 to 3 months). To conduct extended hydrologic tests of this duration without adversely impacting remedial activities of the pump-and-treat system requires that 1) the pumping tests be conducted within the framework of the existing 200-ZP-1 operational system and 2) the observed areal hydrologic response be monitored primarily with the existing monitor well networks.Analytical simulations of areal test responses based on representative aquifer properties within the area and anticipated pumping rates indicate that the radius-of-influence (i.e., drawdown of ≥ 0.01 m) from large-scale, new ZP-1 extraction well tests would be extensive, and for test durations of ≥1 month extend to distances of ≥ 1,000 m from the pumping well location. Simulations of barometric effects on monitor well water-level responses during extended large-scale pumping tests indicate a potential well water-level response change of ≤ 0.3 m. The simulated magnitude of potential barometric pressure effects underlies the need to effectively remove barometric effects from surrounding well water level responses monitored during the extended, large-scale, pumping test. While no universal, large-scale test conclusions can be made from these general simulation evaluatio...

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“…The time required to obtain representative hydrologic property results will be determined using diagnostic derivative analysis results of the drawdown data obtained from the pumped and nearby observation well locations. A detailed description of the use of derivative analysis techniques is provided in and Spane and Wurstner (1993).…”

Section: 7mentioning

confidence: 99%

RCRA Assessment Plan for Single-Shell Tank Waste Management Area TX-TY at the Hanford Site

Hodges¹,

Chou²

2001

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DERIV: A Computer Program for Calculating Pressure Derivatives for Use in Hydraulic Test Analysis

Cited by 83 publications

References 16 publications

Understanding diagnostic plots for well-test interpretation

Understanding diagnostic plots for well-test interpretation

Large-Scale Pumping Test Recommendations for the 200-ZP-1 Operable Unit

RCRA Assessment Plan for Single-Shell Tank Waste Management Area TX-TY at the Hanford Site

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