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Sewer Performance Criteria - Capacity

Sewer Performance Criteria - Capacity

Sewer Performance Criteria - Capacity

(OP)
Most design standards for new construction of sewer pipelines are somethign like d/D of 0.5 for 15-inch pipe and greater.  

But I'm interested in performance criteria of sewer pipelines that have been established for a while and perhaps are flowing at peak d/D of 0.85 but not surcharging.  Just because it is above the design standard is not always justification for replacement.  

Has anyone seen documented performance criteria for sewer pipelines (not design)?

Russ..

RE: Sewer Performance Criteria - Capacity

If it is not a problem, or likely to become one, who cares what d/D is as long as it is less than one ?

good luck dealing with people who see problems where none exist,

also Russ

RE: Sewer Performance Criteria - Capacity

(OP)
This is a preventative measure.  If d/D > 1, the problem already exists.  Sorry but your reponse is useless to me and my client.  

My point is/was what indicators are used by Districts to trigger upsizing of a pipeline due to capacity?  The obvious one is surcharging (d/D > 1)  I have heard that some districts do not conisder there to be a capacity problem until the manhole is surcharging at least 2-ft. Is this common?

Thanks..

RE: Sewer Performance Criteria - Capacity

RWF is correct.  I've never heard of anyone replacing something which is not failing, unless failure is emminently certain.  If the pipe is not overflowing, I doubt anyone will be able to justify money out of next FY budget to tear it out and replace it.

Remember: The Chinese ideogram for “crisis” is comprised of the characters for “danger” and “opportunity.”
-Steve

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