Assessment of hydraulic properties in an unconfined alluvial aquifer near Grand Island, Nebraska

Xunhong Chen

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

A method is presented to analyze time-drawdown data from one or more observation wells for the calculation of four hydraulic parameters for unconfined aquifers: vertical hydraulic conductivity, horizontal hydraulic conductivity, storage coefficient, and specific yield. The hydraulic parameter results are further analyzed for reliability and the possible ranges of the actual parameter values. After verification using a theoretical example, the method was used to analyze pumping test data from 22 observation wells in an unconfined alluvial aquifer near Grand Island, Nebraska. Results indicate that this method can be used to efficiently calculate the four hydraulic parameters in this type of aquifer. The method can also identify the impact of measurement errors on the parameter estimates, and provide ranges of the actual parameter values. The parameter values calculated using this method were compared to those determined using other theories. It is found that this method is very useful for calculating the hydraulic properties from pumping test data and for analyzing the parameter reliability.

Original languageEnglish (US)
Pages (from-to)603-616
Number of pages14
JournalJournal of the American Water Resources Association
Volume34
Issue number3
DOIs
StatePublished - Jun 1998

Keywords

  • Groundwater
  • Hydraulic property
  • Hydrogeology
  • Parameter estimation
  • Partial penetrating well
  • Pumping test
  • Unconfined aquifer

ASJC Scopus subject areas

  • Ecology
  • Water Science and Technology
  • Earth-Surface Processes

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