A Stochastic Analysis of Pumping Tests in Laterally Nonuniform Media
Article first published online: 8 JAN 2008
Copyright 1991 by the American Geophysical Union.
Water Resources Research
Volume 27, Issue 9, pages 2401–2414, September 1991
How to Cite
1991), A Stochastic Analysis of Pumping Tests in Laterally Nonuniform Media, Water Resour. Res., 27(9), 2401–2414, doi:10.1029/91WR01371.(
- Issue published online: 8 JAN 2008
- Article first published online: 8 JAN 2008
- Manuscript Accepted: 14 MAY 1991
- Manuscript Received: 4 APR 1990
Conventional pumping test analysis methodology assumes that aquifer transmissivity is invariant in space. The ramifications of this assumption are examined for hypothetical units whose variations in transmissivity are considered to be reasonable representations of variations possible in natural systems. The dependence of pumping test transmissivity on spatial (angular and radial) and temporal location of observations and the method of drawdown analysis is assessed. The dependence on the angular position of an observation well appears of little significance. Dependence on radial position, however, can be strong. The dependence on the interval of time used in the pumping test analysis is only important in highly variable systems. Methods of drawdown analysis that yield identical estimates in uniform units yield differing estimates in nonuniform ones as a result of a difference in data-fitting procedures. A reasonable estimate of transmissivity at a regional scale can be obtained from a Cooper-Jacob analysis applied at a large duration of pumpage. In general, conventional approaches for pumping test analysis should be viable in the nonuniform aquifers of the type considered here.