Digital Model Studies of Steady‐State Radial Flow to Partially Penetrating Wells in Alluvial Plains

Abstract

ABSTRACTA digital simulation model for the steady‐state radial flow towards partially penetrating wells in the alluvial plains is presented. As the deposits in these plains are heterogenous with several good water‐bearing formations crisscrossed with silty layers, the deposits are treated as a single anisotropic aquifer with water‐table conditions prevailing. The iterative alternate direction implicit technique is used for the solution of the steady‐state flow. The digital simulation model is used to study the effects of anisotropy, screen setting, and screen length on the discharge per unit length of screen; and in evaluating the errors involved in determining lateral permeability from distance‐drawdown data. The digital simulation model is applied to field pump‐test data for purposes of identification of aquifer anisotropy and radius of influence of well, and in evaluation of errors in determining lateral permeability from distance‐drawdown data.