Flood Routnig - Nonlinear Muskingum Model 1

[SinaPeugeot]

Dear all!
one of my colleagues has the following question:
Does anybody know the UNIT of the "k" parameter in the "Nonlinear Muskingum Model"?
Any help would be really appreciated

 

[cvg]

K is time and the units depend on the units used for flow and storage. For english computations, it is in hours

 

[SinaPeugeot]

Many thanks cvg.