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INTRODUCTION OF A MATHEMATICAL STORAGE FUNCTION MODEL BASED ON LUMPING PROCESS OF INFILTRATION THEORY

Estimation and water prediction of the infiltration of rainfall has been always an important task for hydrologists. Richard equation is adopted as a fundamental equation to develop a storage function model. At first stage, a new boundary condition has been introduced and its accuracy has been cross checked with experiments. In the second stage, on the lumping process of non-dimensional form of Richard equation, a compensation factor has been proposed to equalize the semi-lumped equations. Finally the relation between storage and discharge has been achieved by fully lumped equation.