CdW: $C_{dW}$

Constant drag coefficient of sidewalls. Drag on sidewalls is only computed if the wall does not extend up to the free surface. For example, in a compound channel, sidewall drag is only computed within the channel and not on the edges of the floodplain, as shown in Figure 18.

Figure 18: Example of a compound channel, for which sidewall drag is only computed in the channel and not on the shoals.

0.8