However, the design of the subsidiary dams were modified to be the earth-rockfill dam with central impervious geomembrane during the construction under the consideration of the quality of the filling material and the transportation distance.

Developed during the Chinese national 7th and 8th Five-Year key science and technology research project,geomembrane strain gauge was firstly used in-situ to monitor the strain of waterproof geomembrane in the 2nd-stage upstream cofferdam of the Three Georges Project and their good capability for measuring large strain were verified.