BS EN 13361. Geosynthetic barriers. Characteristics required for use in the construction of reservoirs & dams Geosynthetic barriers, Geosynthetic materials, Geotextiles, Impermeable materials, Sealing materials, Barriers, Polymers, Clay, Bituminous products, Construction materials, Reservoirs, Dams, Water retention & flow works, Construction engineering works, Performance, Test methods, Quality control