“…For instance, the usable storage of the Aparan reservoir is 90 mln/m 3 from which 36 mln/m 3 is lost to filtration (Tokmajyan et al, 2020, Yeroyan, 2007. Being unique, highly effective, ecologically clean and having no comparable substitute, "Natlen" (Galstyan et al, 2020) and "PMM" (Galstyan et al, 2020;Tokmajyan et al, 2021), which is used for waterproofing important facilities and structures (subway tunnels, storage dams, dams, canals, reservoirs, treatment facilities, etc. ), has the ability to increase ten times in size when released into an aquatic environment (Galstyan et al, 2020;Tokmajyan et al, 2020).…”