But the two existing reservoirs upstream of Taipei already hang like a sword of Damocles over the downstream areas, ready to cause flooding at any moment. An additional large Pinglin Reservoir in the upper reaches of the Tanshui River would also make the river even drier, dirtier and muddier.
但大台北上游兩個水庫已讓下游危在旦夕、隨時有淹水可能，再加一個坪林水庫，淡水河上游等於又多了一個攔水大壩，河水將更乾枯、更汙濁。