The single-row plastic concrete anti-seepage wall with its top connecting with earth mantle and its bottom with curtain grouting is adopted to protect the lower-reach earth cofferdam of the second-phase Three Gorge project from seepage.

• 三峡工程二期下游土石围堰堰体防渗采用单排塑性混凝土防渗墙、上接土工膜、下接帷幕灌浆形式。