What kind of clay work the best to protect the groundwater from leachate? I know that we need a hydraulic conductivity less than 10^-9 to do that....but I read somewhere that bentonite and kaolinite don't have a low hydraulic conductivity like what we need to do the lining. I need explanation and help. Is it depends on what kind of permeability method do we use? like falling head or constant head? Or like how thick should the bentonite and kaolinite we should use?
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