This knocked 23 years off its life expectancy at a stroke. The catchment area of the Feitsui Reservoir, which is only 30 kilometers from downtown Taipei City, rises to less than 900 meters, and has relatively flat terrain. Since the reservoir was filled it has collected silt at only two-thirds the originally projected rate.
離台北市區只有三十公里的翡翠水庫，集水源頭海拔僅有八百多公呎，流域較為平緩，年淤砂量在蓄水後反比預估少了三分之一。