A modification is made to the conventional evaporation equation to allow the calculation of evaporation from saline lakes. The modified equation shows how, for a given set of meteorological conditions, the evaporation rate, the partitioning of available energy into sensible and latent heat, and the surface temperature, can all be related to solute concentrations. To illustrate the operation of the equation the recent and proposed changes to the hydrology of the Dead Sea were used as a case study.