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Recent content by entp

  1. entp

    InfoWorks - Horton infiltration values?

    I'm using an old version of InfoWorks (long story, don't want to switch in the middle of a project), and trying to figure out what values I should use for Horton infiltration. When I Google it, I can find the theory and occasionally some values, but I can't find a table that relates Horton...
  2. entp

    pressure regulator valves

    OK, thanks. Another question, can a given PRV be set to a range of pressure differentials, or do they have to be set to one pressure differential at the factory?
  3. entp

    Determining domestic water demand

    PS - If the AWWA manual is referring to service lines from the building to the road, then that is probably good. However, you probably don't want to use fixture counts to size the pipe network in the streets, because fixture count estimates are usually too conservative for pipe networks.
  4. entp

    pressure regulator valves

    Hi everyone, I have a simple question about pressure regulator valves. If there is an existing PRV in a vault, is there an indicator on it showing the pressure differential it's regulating? Thanks.
  5. entp

    Determining domestic water demand

    I work for a company with a plumbing group *and* a civil group. Keep in mind that the pipe sizes resulting from the plumbing code are often larger than the sizes resulting from peak demand. This is because the pipes in the building have to be sized much more conservatively than the pipes...
  6. entp

    cleanout vs manhole?

    I guess the problem is that I've never seen the equipment used to clean a sewer and don't know how it works. What does it look like, how big is it, and how is it pulled through? (Google brings up a lot of irrelevant links, so if you know of a good one, feel free....) I was thinking that...
  7. entp

    cleanout vs manhole?

    Hi, I have a simple question re. cleanouts vs manholes. For a private campus-sided sewer system, is it OK to use cleanouts at 90 deg bends? How do you decide? I would think at most, you could use a cleanout at every second 90 deg bend, but not at two consecutive bends. This way every branch...
  8. entp

    sewer pump wet well sizing

    Great, thanks. We're not designing it in detail yet, we just want to know what flow to design it for. It sounds like you guys are saying that the pumps should be designed to pump the peak flow (~4 x average flow), and not the max day flow (~2 x average flow) that I had guessed. So you're...
  9. entp

    sewer pump wet well sizing

    Hi everyone, We're in the planning stages for a project in the middle east, mixed residential and commercial (~60% of the flow is residential). The downstream sewer flow has to be pumped across a bridge. My guess is that you would size the pump for the max day flow (approx 2 x average flow)...
  10. entp

    basic question re. sewer pipe sizing

    Hey everyone, Thank you all for the good information. I do realize we have to check with the local agency before the design gets too detailed, was just looking for some planning ballpark estimates. Thanks also for the population based peak factors, and the references, those are very useful...
  11. entp

    basic question re. sewer pipe sizing

    Hey everyone, I'm trying to determine the rule of thumb for sewer pipe sizing. I know that for water pipes, sizing is usually based on Max Day Demand (gal/day converted to gpm), which is double Average Day Demand (the average day over the year). Are sewer pipes also sized for Max Day flow, or...
  12. entp

    parking stall dimensions - international standards?

    Great, thanks everyone! entp
  13. entp

    shop drawings for invert elevations?

    Great, thanks cvg and bpattengale, that answers my question. (I meant to post earlier to say thanks.)
  14. entp

    parking stall dimensions - international standards?

    Hey everyone, Are there any international standards for minimum parking stall dimensions? Metric is preferred, but in lieu of international standards, American standards would still be helpful. Thanks, entp
  15. entp

    shop drawings for invert elevations?

    Hey everyone, Is it normal practice for the contractor to submit shop drawings for invert elevations for sewer or storm drain construction? Or is it normally only shown on the as-builts whether the elevations are different than what's shown in the construction drawings? Does it matter...
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