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New equations for determining the formation constants of an aquifer from pumping test data
Author(s) -
Boulton Norman S.,
Streltsova Tatiana D.
Publication year - 1975
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr011i001p00148
Subject(s) - aquifer , aquifer test , anisotropy , water table , compressibility , geology , permeability (electromagnetism) , cone of depression , drawdown (hydrology) , geotechnical engineering , water well , aquifer properties , petroleum engineering , soil science , groundwater , mechanics , artesian aquifer , chemistry , physics , biochemistry , quantum mechanics , groundwater recharge , membrane
New equations are given, based on an extended theory, that take into account the following factors: the compressibility and anisotropy of the main aquifer; the partial penetration of the abstraction well; the depth at which the drawdown in an observation well is measured; the existence of a low‐permeability layer, hereafter called ‘the aquitard,’ above the aquifer; and the saturated and unsaturated zones above the water table. A practical method of evaluating the formation constants for an aquifer from pumping test data is fully discussed. Type curves based on the new equations are used to analyze data from a pumping test in the thick Bunter sandstone formation of Shropshire (Great Britain). A correction for the water derived from storage within the abstraction well is found to be necessary.