When handling flammable or toxic liquids or liquefied gases, the occurrence of a leakage and formation of a liquid pool is a scenario to be considered for risk assessment. Several models are available for estimating the evaporating mass flow, but only few experimental data exist for validation purposes. Evaporation experiments, with vapor pressures up to 0.94 bar and with different substances in basins of varying diameter, were carried out, mainly on open-air test sites with different topographies, but also in enclosed spaces. Based on these new data, a validation of existing pool evaporation models was carried out and eventually led to the new formulation of an evaporation model, which is also presented here.