Calculation Methods
Calculation Methods : (1) Elementary. Pre-calculated consequences such as tabulated hazards assessment or SAR results or ready reference graphs/figures. The accuracy is limited, they usually provide plume centerline results at a single receptor, and they are easy and quick to use. (2) Intermediate. Simplified consequence calculations such as hand calculations, nomograms, overlays, and simplified PC-based computer models. Accuracy is limited and they provide a simple plume footprint, centerline and off centerline estimates, results at several receptors, and are relatively easy and quick to use. (3) Advanced. Advanced computerized methods capable of more realistically modeling atmospheric transport and dispersion when operated by a subject matter expert. These are recommended for continuing assessments at high hazard facilities/sites with complex meteorological flows in the region of transport. They more accurately depict plume trajectories and provide complex plume footprints. Although they are generally slow and more difficult to use, recent advances in computer technology are reducing the run times
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