Ozkan and Raghavan Solution for Constant-Head Tests in Fractured Aquifers
A mathematical solution by Ozkan and Raghavan (1991) is useful for determining the hydraulic properties (hydraulic conductivity, specific storage, hydraulic conductivity anisotropy and fracture length) of fractured aquifers with a single vertical fracture intersecting the test well. Analysis involves matching the Ozkan and Raghavan solution to discharge data collected during a constant-head test.
AQTESOLV provides visual and automatic methods for matching the Ozkan and Raghavan solution to constant-head test and recovery test data. This easy-to-use and intuitive software promotes rapid and accurate determination of aquifer properties.
The following assumptions apply to the use of the Jacob and Lohman solution:
- aquifer has infinite areal extent
- aquifer has uniform thickness
- aquifer potentiometric surface is initially horizontal
- fractured aquifer represented by anisotropic system with a single plane vertical fracture that fully penetrates aquifer
- flow is unsteady
- water is released instantaneously from storage with decline of hydraulic head
- diameter of control well is very small so that storage in the well can be neglected
AQTESOLV provides the following options for the Ozkan and Raghavan constant-head test solution for a vertical fracture:
Ozkan, E. and R. Raghavan, 1991. New solutions for well-test analysis problems: Part I-analytical considerations, SPE Formation Evaluation, Sept. 1991, pp. 359-368.