def et_actual_mm(e_24_mm, t_24_mm):
    """
    Computes the actual evapotranspiration based on the separate calculations
    of evaporation and transpiration:

    .. math ::
        ET = E + T

    Parameters
    ----------
    e_24_mm : float
        daily evaporation in mm
        :math:`E`
        [mm d-1]
    t_24_mm : float
        daily transpiration in mm
        :math:`T`
        [mm d-1]

    Returns
    -------
    et_24_mm : float
        daily evapotranspiration in mm
        :math:`ET`
        [mm d-1]
    """
    return e_24_mm + t_24_mm
