EXAMPLE 2 (Estimate effective stack height): A power plant continuously releases a plume. Stack height is 70 m, stack diameter is 5 m, exit velocity is 25 m/s, exit temperature is 398 K, ambient temperature is 298K. If wind speed is 20 km/h at the top of the stack a) how high is the plume 200m downwind of the stack for neutral conditions? b) if there is a ground inversion layer 150 m thick and wind is 10km/hr, will the plume penetrate the inversion layer? Assume temperature increases 0.3 oC through the 150 m of the inversion layer. (See handout .pdf, page second to last Table 18.4For a) use Briggs neutral and unstable; for b) Briggs stable get the potential temperature gradient from Table 18.5, last page of handout)