1Deptt. of Civil Engineering, Indian Institute of Technology, Bombay, Powai, India
2National Institute of Hydrology, Roorkee, Uttaranchal, India
3Deptt. of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803-6405, USA
Using a large set of data of 138 small watersheds (0.17 ha ≤ area ≤ 83.37 ha) from U.S.A., this paper specifically evaluates the antecedent moisture condition (AMC) - dependent rainfall-runoff models which are based on the Soil Conservation Service Curve Number (SCS-CN) method (SCS, 1956). The study reveals that a modified version of the Mishra and Singh (MS) (2002a) model performs better than the existing SCS-CN method. Furthermore, the MS model is also advantageous in that it obviates sudden jumps in the curve number variation with AMC, which is an unreasonable and undesirable feature of the SCS-CN model.
