Solution for flow rates across the wellbore in a two-zone confined aquifer

Sang Yang Yang*, Hund-Der Yeh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


A closed-form solution for transient flow rates across the wellbore in a confined aquifer is derived from a two-zone radial ground-water flow equation subject to the boundary condition of keeping a constant head at the well radius. An aquifer may be considered as a two-zone system if the formation properties near the wellbore are significantly changed due to the well construction and/or well development. An efficient numerical approach is used to evaluate this newly derived solution. Values of the transient flow rate are provided in a tabular form and compared with those obtained by numerical inversion for the Laplace-domain solution. The results show that the two solutions are in good agreement. This newly derived solution can be used not only for predicting the transient flow rate across the wellbore but also for identifying the effects of a skin with a finite thickness on the estimation of transient flow rates in a ground-water system with two different formation properties.

Original languageEnglish
Pages (from-to)175-183
Number of pages9
JournalJournal of Hydraulic Engineering
Issue number2
StatePublished - 1 Feb 2002


  • Aquifers
  • Flow rates
  • Ground water
  • Numerical analysis

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