Determination of water permeability coefficient and radius of influence according to experimental well pad pumping by the method of least squares

Abstract

Calculations of filtration coefficient and radius of influence according to the data of experimental pad pumping are usually made by Dupuis formula. The calculation is performed separately for each pair of observation wells, then the average of the obtained results is determined or the most acceptable value of the filtration coefficient and radius of influence is accepted. Discrepancies between the values obtained by parallel calculations for different pairs of observation wells depend on: 1) the degree of homogeneity of water-bearing rocks; 2) the quality of the experimental work carried out; 3) deviations in the direction of groundwater movement during pumping corresponding to a strictly radial flow. Often, especially in fractured rocks, these discrepancies are significant, and the average of individual obtained values of water permeability coefficient or radius of influence may differ significantly from the true value.