The evaporation from the canopy storage is equal to the reference evapotranspiration, if sufficient water has been intercepted on the leaves, that is
where Ecan is the canopy evaporation [LT-1], Eref is the reference evapotranspiration rate [LT-1] and Dt is the time step length for the simulation.
Note: The amount of evaporation from the canopy is time dependent, since the interception on the canopy is calculated for every time step. So, if you half the time step, then the total amount of water stored in the canopy will double. The total amount of water stored in the canopy in temperate climates is generally small compared to the precipitation. However, semi-arid climates, this may impact your water balance.
