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Analysis of Observation‐Well Response During Constant‐Head Testing
Author(s) -
Mishra S.,
Guyonnet D.
Publication year - 1992
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1992.tb01528.x
Subject(s) - constant (computer programming) , head (geology) , aquifer , wellbore , radius , transformation (genetics) , hydraulic head , variable (mathematics) , flow (mathematics) , magnitude (astronomy) , slug test , mechanics , mathematical analysis , mathematics , geology , physics , computer science , geotechnical engineering , groundwater , petroleum engineering , geomorphology , programming language , biochemistry , chemistry , computer security , astronomy , gene
A simple method for computing transmissivity and storativity from the analysis of observation‐well response during constant‐head aquifer tests is presented. The proposed methodology is based on approximate solutions developed using the Boltzmann transformation technique, and is demonstrated to be valid for many practical situations. It is shown that familiar constant‐rate solutions (e.g., the Theis equation) can be generalized for the constant‐head case if the head change at the observation well is normalized by the flow rate at the test well and then used as the time‐dependent variable. A generalized form of the Jacob‐Lehman approximation which is valid at every point in the aquifer is presented. Analysis of several hypothetical constant‐head test data using the suggested approach indicate that estimates of transmissivity are much more reliable than those of storativity. However, both hydraulic parameters appear to be reasonably estimated if the interwell distance is at least two orders of magnitude larger than the wellbore radius.