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CONSTANT-HEAD PERMEABILITY TESTS PERFORMED IN MONITORING WELLS AT LABORATORY SCALE
Session: Laboratory Testing II / Essais en laboratoire II
Lu Zhang, Ecole polytechnique de Montreal (Canada)
Robert Chapuis, Ecole Polytechnique de Montreal (Canada)
Vahid Marefat, Ecole Polytechnique de Montreal (Canada)
Permeability tests are regularly done in monitoring wells. Two types of tests have been performed in ten wells monitoring a confined aquifer, installed in a large sand box. Electronic transducers have been used to register total pressure and atmospheric pressure versus time. The paper presents first the method used to calibrate the sensors, in order to assess their zero offset and its influence on the test data. Then, it presents the results of the variable-head tests and those of constant-head tests performed using a peristaltic pump, thus as constant flow rate tests until stabilization of the water level in the well pipe. In addition, several types of constant-head tests have been performed: (i) single flow rate as for groundwater sampling; (ii) different flow rates, with or without rest periods between the periods of constant flow rate. The paper presents and discusses the hydraulic conductivity values that have been obtained from the field data for each type of test.
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