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Thank you very much you have all been most helpful.

Thank you, that site did have some useful information, but I couldn't find anything but a chart that showed peak factors.

It was obtained from the City of Bakersfield Sewer Design Standards, but it is a copy of a copy of a....well you know, and no one who works for the city knows where the formula was obtained. The other city I want to use it in is asking if there is a better source or how it was derived.

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...