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  • Users: leeji
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  1. leeji

    Jacking and Boring in Aggressive Soils

    I have a project that requires jacking & boring 400 feet of 48-inch pipe. The pipe will be used as a storm drain, and no separate casing pipe is to be installed. The pipe is to have 10 to 12 feet of cover and will operate under pressure flow. There is a concern with the use of steel pipe...
  2. leeji

    Pressure Fluctuations in Manholes

    BLT, Thanks for all the good suggestions. The lids are normal 2’ Dia (195 lb) lids. The pipes are 36” RCP and an approximate flow is 90 cfs (12.5 fps full flow velocity). Unfortunately, I or the Streets and Drainage folks have not first hand witnessed the actual removal as it is happening...
  3. leeji

    RCP Pipe Sizes

    21" and 27" Pipe (RCP and CMP) is not available (without a special order) in Florida (I'm not sure where you are working though). If you can find it (or get it made), you will probably find it is MUCH more expensive that 24" and 30". If at all possible, stick with the...
  4. leeji

    Pressure Fluctuations in Manholes

    Thanks for the input. This is a fairly interesting problem. We do have the system scheduled for a visual inspection through the offending section. I really am hoping to see a blockage in the system, but from what I could visually inspect in the field, I don’t think that is the case. We also...
  5. leeji

    Pressure Fluctuations in Manholes

    I am evaluating an existing short storm sewer system (8 structures) on a steep overland grade that has a re-occurring problem of the manhole lids being removed during storm events. To eliminate deep excavation for the pipe, there were numerous manhole step-downs constructed with 4' - 6' in...

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