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{\rm Y_{wm}} = \frac{1  - \epsilon_g}{1 -+ \frac{M_{ro}}{M_{rw}}  \cdot \frac{B_w}{B_o} }, \quad \epsilon_g = \frac{A}{q_t} \cdot M_{ro} \cdot \left[ \frac{\partial P_c}{\partial r}  +  (\rho_w-\rho_o) \cdot g \cdot \sin \alpha \right]

{\rm Y_{wm}} = \frac{1}{1 -+ \frac{M_{ro}}{M_{rw}}  \cdot \frac{B_w}{B_o} } = \frac{1}{1 + \frac{k_{ro}}{k_{rw}}  \cdot \frac{\mu_w }{\mu_o } \cdot \frac{B_w}{B_o}}