Abstract
An empirical equation, which relates the infiltration rate to the actual soil moisture content, is proposed and incorporated in the Soil Moisture Accounting and Routing (SMAR) model to demonstrate one application of that equation. A modified SMAR model (SMARY) is developed and tested on four catchments with different climatic conditions. The results show that the SMARY model performs better than the SMAR model in terms of R 2, mean square error and relative error. The modified model provides a more rational interpretation of the physical process of infiltration and also provides a tool for determining the actual infiltration rate under specific soil moisture conditions.
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