How Are Horizontal Releases Modeled?
Some types of processes commonly vent to stacks that either discharge in a horizontal or downward direction or have some type of raincap. These stack orientations and obstructions affect plume rise and dispersion. In order to account for this, the WDNR assigns a default exit velocity of 0.1 m/s to any stack exhibiting the mentioned characteristics, regardless of the source flow rate.
