Landfill covers relying on a balance between soil water storage and evapotranspiration (ET) as the primary means to control drainage were described in a recent paper by Scanlon et al. (2005) in the Vadose Zone Journal. These so-called “ET covers” have been receiving considerable interest in the past few years as economically viable cover systems for landfills in arid and semiarid environments (Hauser et al., 2001; Madalinksi et al., 2003). Scanlon et al. (2005) presented a summary of their studies in Texas and New Mexico, demonstrating an acceptable performance of ET covers in minimizing drainage under their...

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