Determination of water permeability coefficient and radius of influence from data of experimental cluster pumping by the method of least squares
Abstract
Calculations of filtration coefficient and radius of influence from the data of experimental cluster pumping are usually made by the Dupuit 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 the water‑bearing rocks; 2) the quality of the experimental work carried out; 3) deviations of the direction of groundwater movement during pumping from a strictly radial flow. Often, especially in fractured rocks, these discrepancies are significant, and the average of the individual obtained values of the water permeability coefficient or radius of influence may differ significantly from the true value.
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References
- Kamensky G.N. Fundamentals of Groundwater Dynamics. Gosgeolizdat, 1943. (in Russian)
- Kohl S.A. Graph-analytical method of determination of rock filtration coefficient by the results of water pumping at the filtration site and some issues related to its application. Coll. 9 Sbornik 9 Gidroenergoproekta. Gosenergoizdat, 1941, No. 9. (in Russian)
- Kerkis E.E. Determination of the radius of influence when calculating water inflows. Ugletekhizdat, 1945. (in Russian)