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Analysis of Shallow Hard Rock Well Pumping and Recovery Test Data a
Author(s) -
Zdankus Narimantas T.
Publication year - 1974
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.1745-6584.1974.tb03037.x
Subject(s) - drawdown (hydrology) , aquifer , inflow , hydraulic conductivity , geotechnical engineering , well test (oil and gas) , geology , flow (mathematics) , radius , aquifer test , water table , function (biology) , mechanics , computation , test data , groundwater , boundary value problem , water well , soil science , mathematics , petroleum engineering , mathematical analysis , engineering , physics , computer security , software engineering , algorithm , oceanography , computer science , biology , groundwater recharge , evolutionary biology , soil water
In this paper equations for calculation of steady, unsteady, confined and unconfined radial ground‐water flow to wells are compared and unified by a single general equation. The validity of the equation is expanded by applying it to a shallow hard rock aquifer where hydraulic conductivity varies with depth. Recommendations are given as to employment of said equation for analysis of pumping and recovery test data of shallow hard rock bore and dug wells. The suggested method for analysis of bore well test data is based on the principle used by Jacob in his method (1950). Drawdown function as function of time is used for graphical analysis of test data. Because of seepage face phenomenon, drawdown measured in water‐table wells must not be used for computation of drawdown function. The function to be computed from drawdown is measured in the aquifer. Hydraulic conductivity is determined from dug well test data as a function of ground‐water inflow into the well discharge which varies during pumping and recovery test because of significant accumulating capacity of the well. Specific yield for the calculation is assumed according to the type of rock, and radius of influence is expressed as a function of time. Derived equations can be used also for hydraulic computation of shallow hard rock water‐table wells.