The LPOOL model has been contributed to HGSYSTEM by EXXON Research and Engineering Company. LPOOL describes the time-dependent spreading and evaporation of a liquid pool. LPOOL can handle boiling and non- boiling pools, both on land and on water. LPOOL can treat two-phase, multi- compound mixtures of non-reactive species. LPOOL also includes modelling of a spill into a dyke (bund) and the subsequent evaporation from this type of spill. LPOOL replaces the EVAP model.

To run LPOOL chemical information relevant to the system of interest should be incorporated into the DATAPROP data base.