Application of A Gaussian Plume Model of Odor Dispersion To Select A Site For Livestock Facilities

The ideal separation distance between a livestock facility and the nearest neighbor to avoid an odor nuisance has not been determined and is somewhat subjective. A windows based computer program was developed to be used as an educational tool and decision aid for planning livestock facilities. The major focus is on control and dispersion of odor, with a secondary emphasis on nutrient management. The odor dispersion model, based on a Gaussian Plume model, was used to predict the level of odor downwind from the odor source. The input variables include wind speed, atmospheric stability categories, odor source strength, and one of two terrain roughness classes. The terrain classes represent a facility surrounded by a flat, open field with crop stubble, or surrounded by a forest barrier. A sensitivity analysis was performed on the primary input variables, and the results are presented in graphical and tabular form. The results provide an objective basis for the evaluation of the suitability of a site for the location of livestock production facilities. Model results indicate that the uses of a forest barrier and odor source control are the most important factors in limiting odor dispersion.