Capped and horizontal stacks that are subject to building downwash should not be modeled using

an effective stack diameter to simulate the restriction to vertical flow since the PRIME

algorithms use the stack diameter to define the initial plume radius which, in turn, is used to

solve conservation laws. The user should input the actual stack diameter and exit temperature

but set the exit velocity to a nominally low value, such as 0.001 m/s. This approach will have

the desired effect of restricting the vertical flow while avoiding the mass conservation problem

inherent with effective diameter approach. The approach suggested here is expected to provide a

conservative estimate of impacts. Also, since PRIME does not explicitly consider stack-tip

downwash, no adjustments to stack height should be made.



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