\begin{equation}
    \lambda E _{evap}^{old} = \lambda E_{evap}^0  \left( 1-\beta_{v1} \beta_v \left( \frac {  B_q^{orc} - \alpha_v q_{s, sat}  }{  z_{ikq} - A_q^{orc}  }  \right) \right)
\end{equation}
