 This project involved raising the height of the Danjiangkou dam by increasing the dam crest elevation from 162 m to 176.6 m above the sea level.This addition to the dam's height allowed the water level in the reservoir to rise from 157m to 170 m above the sea level.And this, allowed the flow into the water diversion canal to begin "downhill", pulled by gravity, to the lower elevation of the canals.