Lee Cheng-haw, citing a hundred years of proven experience in Europe, points out that in thinking about groundwater the notion of controlling "water levels" should replace the current idea of managing "water volume." because even if the water volume of an area is considered adequate, an over-concentration of pumping will still create problems like land subsidence.
李振誥並以歐洲百年的實證經驗指出，地下水經營思維應以「水位」控管代替目前的「水量」管理，因為一個地區就算水量沒有超支，但過度集中抽取，仍會造成地層下陷等問題。