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  1. mrwhiteOH

    PVC Pipe Deflection - Egging

    I must respectfully disagree with rconnor in stating the long term creep of thermoplastics is common sense. Reference is made to an extensive study by the Battelle Institute for the City of Columbus, Ohio in which the 30 day inspection recommendation is made. Further, work at Ohio University...
  2. mrwhiteOH

    PVC Pipe Deflection - Egging

    This is a never ending debate. How much deflection can a thermoplastic pipe withstand without distress? You say it is a profile wall pipe, which makes this a much tougher question to answer since the amount of bending induced strain in the pipe wall is dependent on the profile. However, my...
  3. mrwhiteOH

    Stiffness of Buried FLexible Pipe

    See A.P. Moser text on "Buried Pipe Design" by McGraw Hill or Pipe Mechanics (I think this is the title) by Watkins
  4. mrwhiteOH

    LRFD vs LFD

    In General: LFD is load factor design - meaning all safety factors are applied to the load. The factored load can be as high as the ultimate load. LFRD is load factor resistance design - meaning safety factors are applied to both the load (demand) and to the materials (resistance). In theory...
  5. mrwhiteOH

    need help finding storm information

    Hourly precipitation data is available from NOAA with about a month or two of lag. Keep in mind that their data is for the location of their gages. regards, KEW
  6. mrwhiteOH

    Min. cover on RCP

    I am new to the forum so I hope this is not too late to be of use. Generally speaking minimum covers are not for load carrying capabilities, for RCP pipe the worst load is the three-edge load which is directly related to pipe class. In the field, regardless of how shallow the cover, the...
  7. mrwhiteOH

    Rational method application

    The issue I see with using rational method for a detention facility is not related to drainage area (Different sources will give differing limiting values, anywhere from 50-250 acres, personally I think about 200 is max.) but rather the fact that a hydrograph cannot be constructed from rational...
  8. mrwhiteOH

    hy8 culvert inlet categories

    Sorry if this is too late to be useful. Standard precast type inlets are all considered conventional. Side and slope tapered inlets are very specific design situations using very specific design standards. Thesze topics are covered in various federal (FHWA) publications whihc are free to...

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