Erratum: A mixing length model for estimating channel conveyance

The publisher regrets that the following errors appeared in this paper when it was published in Water Management 166(4): 165–174.

Equations 4 and 5 were published as

\begin{matrix} τ_{x y} = ρ l^{2} | \nabla u | + \frac{\partial u}{\partial y} \\ τ_{x z} = ρ l^{2} | \nabla u | + \frac{\partial u}{\partial z} \end{matrix}

\frac{\partial τ_{x y}}{\partial y} = ρ l^{2} | \nabla u | + \frac{\partial^{2} u}{\partial y^{2}} + ρ l^{2} \frac{\partial | \nabla u |}{\partial y} \frac{\partial u}{\partial y} + 2 ρ l \frac{\partial l}{\partial y} | \nabla u | \frac{\partial u}{\partial y}

They should be

\begin{matrix} τ_{x y} = ρ l^{2} | \nabla u | \times \frac{\partial u}{\partial y} \\ τ_{x z} = ρ l^{2} | \nabla u | \times \frac{\partial u}{\partial z} \end{matrix}

\frac{\partial τ_{x y}}{\partial y} = ρ l^{2} | \nabla u | \frac{\partial^{2} u}{\partial y^{2}} + ρ l^{2} \frac{\partial | \nabla u |}{\partial y} \frac{\partial u}{\partial y} + 2 ρ l \frac{\partial l}{\partial y} | \nabla u | \frac{\partial u}{\partial y}

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