The dominant common residuals method is similar to the multiplicative method, except that the CMFs are non-independent of one another or slightly overlapping. The combined effect of the various treatments being applied is calculated by multiplying the individual CMF values together for each countermeasure and then raising that value to the power of the most effective or lowest CMF value. The following is an example of how the dominant common residuals method’s combined CMF value is calculated:

CMF

Combined

= (

CMF

1

×

CMF

2

×

CMF

3

)

CMF

1

This method is more conservative than the multiplicative method, but it is not appropriate for CMFs with values greater than 1.0 or if the most effective treatment has a CMF value greater than 1.0. A combined CMF value that is raised to a power greater than 1.0 intensifies the effects of the combined CMF rather than dampening its effects.