Underground water reserves in Taipei were originally very high, but as the population boomed after World War Ⅱ, water was withdrawn and the ground sank.
台北盆地的地下水位原本很高，在光復前甚至呈自流狀態，以後由於人口增加，自來水還沒有普遍供應之前，地下水被大量抽伋，導至地陷。