## Common Variable Peaking Factors

Some of the most common variable peaking factor (PF) calculation methods are:

## Babbitt

Where: P = Contributing population (number of capita)

## Harmon

Where: P = Contributing population (number of capita)

## Ten States Standard (Great Lakes Upper Mississippi River Board)

Where: P = Contributing population (number of capita)

## Federov

Where: Q = Base dry weather load (l/s)

Note: The Babbit peaking method does not converge to 1. For populations larger than 3,125,000 the peaking factor will become smaller than 1.

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