Kuyambira m'ma 1950, mainjiniya apanga bwino ndi geomembranes.Kugwiritsa ntchito ma geomembranes, omwe amatchedwanso flexible membrane liners (FMLs), kwawonjezeka chifukwa cha nkhawa yomwe ikukulirakulira pakuipitsidwa kwa madzi ofunikira.Zipangizo zama porous zachikhalidwe, monga konkriti, admi ...
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