https://www.springerprofessional.de/polymeric-geomembranes-for-bridging-discontinuities-in-dams-face/16693062
The first use of a polymeric geomembrane as only water barrier in dams dates to the 1950s. In 1959 a geomembrane covered by unreinforced concrete
polymeric geomembranesbridgingdiscontinuitiesdamsfaces