I am wondering how to properly set the vegetation density in Mflow_02. The manual says that you can choose between specifying either the vegetation density or the vegetation height and permeability coefficients.

When selecting the vegetation density option, how can I adjust the drag coefficient of the vegetation?

When selecting the vegetation height and permeability coefficient, how can I estimate the permeability coefficients for different vegetation. ie. what units are the permeability coefficient in, or what is a ratio of?