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Original Articles

A Simple Technique for Determining The Maximum Ground Level Concentration of An Elevated Gaseous Release

Pages 866-870 | Published online: 13 Mar 2012
 

Abstract

A screening technique has been developed to determine the maximum one-hour ground level concentration of a gaseous emission from a stack located In flat terrain. The method does not require the use of a computer and eliminates the usual trial and error calculations. An infinite mixing height is assumed. It involves a linear or quadratic solution of the gaussian plume diffusion as a function of the effective stack height and a linear approximation of the Briggs plume rise equation. The linear approximation of the former gives results that are within 5 % of the gaussian plume results for stability criteria A, B, and C. For stability criteria D, the difference can be as great as 80%. If a quadratic estimation Is used, the differences are less than 3% for stability criteria A, B, and C, and are within 18% for stability criteria D. A linear approximation is used for the Briggs plume rise equation. This gives results within 4% of the Briggs equation. Overall, this is a simple straightforward approximation which gives results which can be used to determine if more sophisticated procedures are necessary.

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