Figure 2.

Velocity solutions to (2.2) which maximize average power (2.3) for λ₀=0. Red curve is the intuitively derived extreme case solution for ${\lambda }_{\mathrm{F}}^{max}=\mathrm{\infty }$, blue curve is the optimal solution to (2.2) for ${\lambda }_{\mathrm{F}}^{max}={\lambda }_{\mathrm{F}}^{\mathrm{GC}05}$ and the green curve is GC05's optimal solution for constant λ_F. Velocities are relative to the peak flow in the channel when there is no farm.