 # What is "a" in the Projected Break Rate equation?

 Product(s): WaterGEMS, WaterCAD Version(s): 08.11.XX.XX and 10.00.00.XX Area: Calculations

# Problem

In the Pipe Break analysis, the projected break rate is a weighted sum between the individual and group break rate according to the following equation?
Projected break rate = a (Individual break rate) + (1-a) (Group break rate)

What does the 'a' coefficient represent in this equation?

Where is the 'a' value defined?

# Solution

What does the 'a' coefficient represent in this equation?

The 'a' coefficient represents the extent to which the overall scaled pipe break rate for the pipe is based on the individual pipe's history (a value near 1) or the group's history (a value near 0).

Moving the slider to the left, lowers 'a' and increases the importance of the group while moving it to the right increases 'a' and decreases the importance of the group.

Where is the 'a' value defined?

This a coefficient can be set in the Pipe Break Analysis window, under the Options tab. [Solution ID: 500000076522]