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  1. 91markus

    smelly manhole

    I'll second the notion of sealing and running a vent stack somewhere a few feet away from the problem manhole. Venting and using vent stacks is almost exclusively done on industrial sewers where H2S levels are high enough to be aestetically unpleasant but not high enough where H2S levels are...
  2. 91markus

    Inverted siphon ?

    As someone has already eluded above, siphons require CONSTANT flow and above average velocities in order to work properly and problem free. Siphons were around long before pump stations were and work on sound engineering principles. If its a 10" line, I would assume that you would be...
  3. 91markus

    pvc pipe

    Although I cannot be certain, I do believe the Sverdrup study was in fact done on a sanitary sewer basin (I think it was in Nashville - ealry to mid '90's). However, as was eluded to in earlier posts, the jointing does in fact cause significant reduction in the "true" Manning's...
  4. 91markus

    SAN SEWER REHAB-SLIPLINING OR CURED IN PLACE?

    bobbert, For what its worth, I think that CIP is your best bet. Depending on how the job can be set-up, I know that even CIP contracotrs like doing longer installs as it allows them higher productivity on the job and less risk due to flooding the SC user. And as we all know, when it comes to...
  5. 91markus

    SAN SEWER REHAB-SLIPLINING OR CURED IN PLACE?

    cvg makes a good point in allowing the market to decide which is the least expensive solution, but this isn't always the best technical solution. What's the predominant factor leading to the rehab??? Is it due to I&I or structural reasons? Also, what "value" do you place on the...
  6. 91markus

    pvc pipe

    IIRC, Sverdrup did a study with one of the CIPP contractors a few years ago measuring Manning's "n" values in existing VCT/RCP/PVC pipe before and after lining and two of the predominant factors in affecting Manning's "n" was found to be joints and slime growth. I believe...

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