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Recent content by bank

  1. bank

    Inline Detention

    We are proposing to use concrete box culverts for inline detention beneath the streets. Does anyone know of a product or method of closing off/sealing the upstream ends of the boxes? I found a company in Canada that manufactures plugs, but they only deal in metric sizes. I've been unable to get...
  2. bank

    EPASWMM

    Thanks for all the comments folks. We ran the model using SCS hydrograph data and submitted it. We were then told that we needed to use a Clark's Unit Hydrograph to generate the input data. At least now I have some direction. Now I get to figure out how to do that.
  3. bank

    EPASWMM

    Thanks guys. I see my next step is to sit down with Public Works and see if the actually do have criteria regarding the rainfall distribution. Since they have not been using SWMM in the past it might be something they haven't considered.
  4. bank

    EPASWMM

    I've been given an assignment to model 2- and 100-year storms for a 70-acre site using EPASWMM. Previously, the local jurisdiction wasn't particular about what software was used on a project, but for some reason they are requiring SWMMM for this one. We have the appropriate IDF curves and...
  5. bank

    Water line fittings

    Simple question: Are wye fittings ever used on water mains? I'm used to seeing tees where a water line connects with another one, but I have a set of drawings in front of me on which the engineer is showing a lot of, what I consider unnecessary, wyes. The water mains are primarily 8" and 12".
  6. bank

    Public vs Private Design and Permitting

    Generally, at least down here, the City or local governing agency owns and maintains water, sanitary, and storm sewers in the public right-of-way or dedicated easements. Design is governed by their criteria. On private property those utilities are owned and maintained by the property owner...
  7. bank

    Pipe Zone Compaction

    Thanks everybody. The contractor has pulled the pipes out of the ground and is going to re-install them per the contract documents.
  8. bank

    Concrete Paving

    Construction joints and contraction joints are definitely not the same thing. Construction joints are placed at starting and stopping points where the concrete pour is interrupted for some reason (e.g., end of shift, equipment breakdown, etc). They are are formed using a bulkhead made of steel...
  9. bank

    Pipe Zone Compaction

    Richard: The design called for three parallel barrels of 30" HDPE pipe in a common trench, spaced 55" center to center. The contractor instead dug three separate trenches that appear to be spaced almost ten feet C-C. He claims that he provided six inches between the pipe and the trench wall, but...
  10. bank

    Pipe Zone Compaction

    Sorry BigInch. I forgot to mention that in widening the trench they would also place the Class I or II material in the void and compact it.
  11. bank

    Pipe Zone Compaction

    We designed an underground detention system using 30" HDPE pipe. According to our details and ASTM 2321 the trench is supposed to have a minimum clearance between the pipe and the trench wall of 10", backfilled with compacted Class I or II material. The contractor instead set the pipe in a...
  12. bank

    Alternate detention options?

    Some municipalities allow you to use the parking lot for detention. Down here you can include up to nine inches above your inlet grate as part of your detention storage.
  13. bank

    SWPPP Reports

    In Houston/Harris County TX we (engineers) typically prepare SWPPP plans and include them in the plan sets issued for permit and construction. The contractor is responsible for obtaining the permits. Either the contractor or owner submits the NOI and NOT. I believe, for permitting purposes, all...
  14. bank

    Design Engineers Competency?

    When I was in college somebody decided that the engineering curriculums were too technical. In Civil Engineering they added three additional semesters of English, two or three "cultural herritage" electives, and gave you a choice among many subjects that used to be mandatory. I am seeing the...
  15. bank

    Problem Asphalt

    A parking lot we designed was recently completed. Visual inspection revealed areas with what appears to be fine, loose asphalt on the surface. Core density reports done on the pavement showed compaction below what was specified in 14 of 16 samples. Twelve of the samples show a core depth more...
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