Why won ALOHA make predictions further than 6 miles (10 kilometers) downwind from a release point?
A. There are several reasons we have imposed this limitation in ALOHA. The primary reason for this cutoff is related to the equations ALOHA uses to predict threat zone length. These equations came from a series of field experiments in which gases were released and tracked as they traveled downwind. In those experiments, nearly all the measurements were taken within 0.6 miles (1 kilometer) of the release point, and in only a few cases were measurements taken as far as 6 miles downwind. This means that we can’t be sure that the dispersion estimation methods used by ALOHA and other air models would be accurate farther from the source. Also, over longer distances effects such as terrain steering can significantly affect the threat zone, and ALOHA does not include such effects in its prediction.
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