ESTIMATION OF GROUND WATER RECHARGE DUE TO RAINFALL BY MODELLING OF SOIL MOISTURE MOVEMENT

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Abstract
The purpose of this study is to estimate the ground water recharge due to rainfall by studying one-dimensional vertical flow of water in the unsaturated zone. A model has been formulated for finite difference solution of the non-linear Richards equation applicable to transient, one-dimensional water flow through the unsaturated porous medium. Implicit scheme with implicit linearization (prediction-correction) has been used for discretization. The ground water has been estimated using appropriate initial and boundary conditions for storm and interstrom periods.