Catchment area-based evaluation of the AMC-dependent SCS-CN-based rainfall–runoff models

Abstract

Using a large set of rainfall–runoff data from 234 watersheds in the USA, a catchment area-based evaluation of the modified version of the Mishra and Singh (2002a) model was performed. The model is based on the Soil Conservation Service Curve Number (SCS-CN) methodology and incorporates the antecedent moisture in computation of direct surface runoff. Comparison with the existing SCS-CN method showed that the modified version performed better than did the existing one on the data of all seven area-based groups of watersheds ranging from 0Ð01 to 310Ð3 km2.