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Starpoint Software Inc.
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  5. StepMaster - Aquifer Step-Drawdown ...

StepMaster - Aquifer Step-Drawdown Pumping Test Analysis Software

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Everyone performs step-drawdown tests but few people know how to analyze the data. Analyzing step-drawdown tests requires the use of complex graphical techniques which are not widely taught. StepMaster uses graphical analysis methods to analyze step-drawdown tests quickly and reliably. No other program is designed specifically for Step-Drawdown like StepMaster.

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aquifer test software
  • Eden-Hazel (step-drawdown and recovery to estimate aquifer transmissivity linear well loss coefficients)
  • Birsoy-Summers (step-drawdown and recovery analysis to estimate aquifer transmissivity and storativity)
  • Hantush-Bierschenk (to estimate linear and non-linear well loss coefficients)
  • Accepts up to twelve pumping rates (it is not necessary for rates to be consecutively increasing or of the same duration)
  • Write tab delimited tables of special values Eden- Hazel`s H and Birsoy-Summers adjusted time. This allows further independent analysis.
  • All calculations are displayed in moveable, customizable text boxes.
  • Arithmetic, Semi-Log, and Log-Log graphs
  • Extensive ability to eliminate unwanted data or entire steps from the analysis
  • The Eden-Hazel method is a two-part graphical analysis.  The method provides estimates of aquifer transmissivity and an equation describing well drawdown with pumping rate as the independent variable.  (15332 bytes)
  • The Birsoy-Summers is a graphical method to provide estimates of aquifer transmissivity and storativity.  (17720 bytes)
  • Shown here is the Clark (1978) data set, in the first graph of the Hantush-Bierschenk analysis. The Hantush-Bierschenk method does not provide T or S, but does provide well loss coefficients and an equation describing well drawdown with pumping rate as the independent variable. (15531 bytes)
  • Shown here is the Eden-Hazel method with the Calliope example data set published with the original Eden-Hazel paper.  The Eden-Hazel method works with increasing or decreasing discharge rates as well as recovery data.  (16216 bytes)
  • Show here is an arithmetic time-drawdown graph where the initial step was pumped at a higher rate than subsequent steps. Even this data can provide reliable estimates of aquifer transmissivity with StepMaster.  (15902 bytes)
  • Shown here is the above data analyzed with the Eden-Hazel method. (18502 bytes)
  • The Eden-Hazel method also provides transmissivity estimates for a simple constant rate pump test with recovery data, as shown here with an example data set from Todd (1980) (16505 bytes)
  • Show here is a semi-logarithmic graph of the above recovery data. (14714 bytes)