Comment:

The value for this variable is a constant with respect to the class variable: Plant species. "It is clear that the success of this model as a predictive tool requires the knowledge of the bulk drag coefficient. The value of this parameter depends on the flow around the plants and the plant motion, which are functions of the hydrodynamic and biomechanical characteristics. However, the correct modelling of swaying motion is far from trivial not only for the difficulty of solving a nonlinear dynamic oscillator with n degrees of freedom, but also for the complexity and randomness of geometric and biomechanical properties of the plant"