def calc_system_multiplier(grow_system):
    """
    System Multiplier
    Notes
    -----
        Standard yield isn't 100% accurate and doesn't consider high density vertical farming systems. The estimated yield
        from ZipGrow Ziprack_8 is 66,825 kg/year for 235m2 plant area. Adjusted yield without multiplier is  18447.5 kg/year
        66,825/18447.5 kg = 3.622442065320504
    """
    if grow_system == 'ziprack_8':
        system_multiplier = 3.622442065320504
    else:
        raise RuntimeError("Unknown grow system {}".format(grow_system))
    return system_multiplier