Hydraulic Properties and Uncertainty Analysis for an Unconfined Alluvial Aquifer

Xunhong Chen, James Goeke, Scott Summerside

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Abstract

An inverse computational method was used to analyze pumping and recovery tests conducted in an unconfined alluvial aquifer along the Republican River valley in Nebraska. At each test site, a high-capacity irrigation well was used as a pumping well, and eight observation wells were constructed to measure drawdown during the pumping and recovery tests. The test data were analyzed for four hydraulic parameters: the vertical (Kz) and the radial (Kr) hydraulic conductivity, the storage coefficient (S), and specific yield (Sy). This method provides not only the average values but also estimated standard errors, confidence intervals, and correlation for the aquifer parameters. The standard error and confidence interval indicate the quality of the parameter estimates, and the correlation coefficients are useful in the evaluation of the relationship among the four parameters. High pumping rates seemed to reduce the effects of well borehole storage on drawdown. Because of the significant amount of early-time data collected, the tests gave high-quality S values. Kr values for most observation locations range from 90 to 120 m/d. It was found that Kr and Sy had a higher correlation and the ratio of Kr/Kz varied from approximately 10 to 30.

Original languageEnglish (US)
Pages (from-to)845-854
Number of pages10
JournalGround Water
Volume37
Issue number6
DOIs
StatePublished - Jan 1 1999

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ASJC Scopus subject areas

  • Water Science and Technology
  • Computers in Earth Sciences

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