 This study compared three different methods to estimate evaporation fluxes during simulated summer conditions in a grass-covered lysimeter in the laboratory. Two of these methods could accurately partition total evaporation into transpiration, soil evaporation, and interception. The third method, which relied on isotopic mass balances, was found to be more accurate for low-temporal resolution analysis, whereas the hydrous 1D was better suited for high-temporal resolution analysis. This article was offered by S. J. Satanto, J. Wenninger, A. M. J. Coenders-Garrett's, and others.