## Peaking Factor Formula?

## Peaking Factor Formula?

(OP)

I am doing a Sewer Study for a small city in Kern County and in doing so I have been applying the peak factor to obtain my peak flow using this formula:

PF = 2.65 x Qavg^(-0.1)

However I cannot find anything to reference it to, nor have I found any other formulas that I could use. Does anyone else use this formula, and if so where did you obtain it? Thanks in advance.

PF = 2.65 x Qavg^(-0.1)

However I cannot find anything to reference it to, nor have I found any other formulas that I could use. Does anyone else use this formula, and if so where did you obtain it? Thanks in advance.

## RE: Peaking Factor Formula?

## RE: Peaking Factor Formula?

## RE: Peaking Factor Formula?

Water and sewer flow factors are somewhere on this website. Don't remember exactly where, but you'll probably be interested in poking around anyway. There are lots of design guides, specifications and std methods to be found here,

http://www.sdwas.com/html/Vol1/Vol1TOC.htm

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

## RE: Peaking Factor Formula?

## RE: Peaking Factor Formula?

Wastewater Systems Engineering by Homer W. Parker and,

ASCE Manual of Practice N0. 37

There are also the Ten State Standards but they may not be applicable in California.

For a small City you may want to use a higher peaking factor than you would for a larger system. See if you can find a City or Cities of similar size and demographics and ask them for flow records for at least the last 2 to 5 years.

Don't forget Infiltration & Inflow; especially if the system is old.

good luck

## RE: Peaking Factor Formula?

http://www.hawsedc.com/peakfact.htm

## RE: Peaking Factor Formula?

Qp/Qavg = [18+(sq rt of Pop in thousands)] / [4+(sq rt of Pop in thousands)].

At Pop=1, factor = 4.5.

At Pop=100M, factor = 1.0.

That seems very common-sensical to me.

Engineering is the practice of the art of science - Steve

## RE: Peaking Factor Formula?

h

From Fair and Geyers textbook, "Water Supply and Wastewater Disposal"

## RE: Peaking Factor Formula?