However, because no agreement on method could be reached, and also because of the protests of experts who claimed that the costs were too high and the benefits too few, these projects were never carried out.
但由於各界對此計畫的意見不一，許多專家評鑑認為，費用太高、效益太低，不值得興建。由於反對的聲浪頗高，因此迄今十餘年一直未能定案。