Section 5.4 presents stack design procedures and lists the weather parameters required. The stack height design must consider the average height at stack elevation, average temperature, average mixing conditions (stability), and average lapse rate. The stack height design must also consider the average height and frequencies of inversions. For emission sources such as generating stations, the ideal stack height should exceed the most frequent inversion height. Also, planners should consider not only the averages of temperature, wind speed, and stability, but also the frequency with which worst-case combinations of these parameters occur.
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