The measurement of actual works also explained that the use of compound geotextile in rock fill dam surface can reduce the amount of leakage water by 60%, the effects of imperviousness are obvious.

• 此外,实际工程观测也说明,砌石坝构筑复合土工膜坝面防渗体后,漏水量减少了60%25,防渗效果良好。