Discussion of “Assessment and review of the hydraulics of storage flood routing 70 years after the presentation of the Muskingum method”

Variable Parameter Muskingum Discharge Routing Method for Overland Flow Modeling

“…However, the physical justification of the VPMC method based on the concept of matching the physical and numerical diffusion is questionable [18] on the pretext that since this method is based on the concept of matching the numerical diffusion with the Hayami's physical diffusion equation [19], the method should work for the entire range of the physical diffusion equation. However, it is a well-known fact that the VPMC method is only applicable for a small range [20] of the physical diffusion equation.…”