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DEGADIS is a dense gas dispersion model that estimates concentrations downwind from an accidental chemical release where the dispersing toxic or flammable substance is initially heavier than air. It is ideal for determining toxic endpoint distances and distances to lower flammability limits (LFLs) for certain toxic and flammable chemicals in accordance with EPA’s Risk Management Program (RMP) requirements.

DEGADIS accounts for ground-level area and vertical jet releases that may be either finite or continuous in duration. For a vertical jet release, the Ooms model is used to predict the trajectory and dilution of the gas or aerosol and DEGADIS predicts the ensuing ground-level concentrations after the plume has returned to ground. DEGADIS also has the unique capacity to model both of these source types as transient releases, where the emission rate and source dimensions vary with time. DEGADIS can account for heat transfer between the plume/ambient air interface and plume/ground interface.

DEGADIS is included in the BREEZE HAZ DISPERSION, BREEZE HAZ PROFESSIONAL and BREEZE LFG Fire/Risk product suites.

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Breeze DEGADIS Software, Service, and Support