def height2rate(height_of_rainfall, duration):
    """
    calculate the specific rain flow rate in [l/(s*ha)]
    if 2 array-like parameters are give, a element-wise calculation will be made.
    So the length of the array must be the same.

    Args:
        height_of_rainfall (float | np.ndarray | pd.Series): height_of_rainfall: in [mm]
        duration (float | np.ndarray | pd.Series): in minutes

    Returns:
        float | np.ndarray | pd.Series: specific rain flow rate in [l/(s*ha)]
    """
    return height_of_rainfall / duration * (1000 / 6)