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\begin{equation}\tag{172} D_b = A_\varepsilon \rho_w gh \frac{H_w^3}{T_w (4 h^2 -H_w^2} \end{equation}
\begin{equation}\tag{172} D_b = A_\varepsilon \rho_w gh \frac{H_w^3}{T_w (4 h^2 -H_w^2} \end{equation}