Plume mass captured by the cavity is well-mixed within the cavity. The captured plume mass is re-emitted to the far wake as a volume source. For GEP height stacks, buildings downwash is not used. Straight line plume transport is assumed to all downwind distances. Speed Vertical wind speed is assumed equal to zero.
Perfect reflection is assumed at the ground.
Chemical Transformation Chemical transformations are treated using exponential decay. Time constant is input by the user. Environmental Protection Agency, 1992. Comparison of a Revised Area Source Algorithm for the Industrial Source Complex Short Term Model and Wind Tunnel Data. Environmental Protection Agency, 1992.