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Guidance on Reduction Factors <br />Application <br />RF;n RF,, <br />RFCC <br />RFtc <br />Landfill cover drainage layer <br />1.3 - 1.5 1.1 -1.4 <br />1.0 - 1.2 <br />1.2 - 1.5 <br />Landfill leachate collection <br />and detection layer <br />1.5 - 2.0 1.4 - 2.0 <br />1.5-2.0 <br />1.5-2.0 <br />Reference: <br />Koerner (1998). Designing with Geosynthetics , Fourth Edition. <br />