The authors of the original paper used data of a laboratory diverging flow model with S0 1⁄4 0.2079, R 1⁄4 0.91 m, n 1⁄4 0.01, and apex angle θ 1⁄4 1.34 rad. For the research reported in the original paper, using Manning’s equation for a wide channel, the kinematic wave parameters will be m 1⁄4 5=3 and k 1⁄4 45.6 (in SI units). For rainfall intensities of ie 1⁄4 78 and 115 mm=h, the rising limb of the hydrograph (Q 1⁄4 kRθym) is computed by the discusser, and shown in Fig. 1(a). Fig. 1(b) shows the corresponding timedependent flow depth. The peak discharge and flow depth under the equilibrium condition are also shown on Fig. 1. The equilibrium flow depths are very small. For these small flow depths (y < 0.14 mm), the Manning equation is not valid as a rating curve. The verification of proposed model needs suitable data for which the Manning equation (or a rating curve) is valid. It seems, for the considered data in the original paper (very small flow depth), that the kinematic wave modeling reported in the original paper is not valid. Concentration time is a key parameter in modeling and analysis of hydrological systems. This parameter depends directly on considered the rating curve. Thus, selection of a valid rating curve is of considerable importance to hydrological modeling with the aid of kinematic wave theory.