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  1. waterguy

    SWM an storm sewer design

    I don't think you're going to get a definitive answer on this one. Sizing your storm sewers based on the 2-yr post-development flow (or whatever your minor system storm is) is a reasonable method even though you may not utilize the capacity due to the downstream restriction. It's at least a...
  2. waterguy

    Poll - Pond Routing Software

    Thanks sam74, I had a feeling this might be the case.
  3. waterguy

    Poll - Pond Routing Software

    Good Day, Sorry for the slightly off-topic question, but does Hydraflow Hydrographs 2004 allow you to enter data in metric units ? I've read their literature online and they specifically mention English or SI units as an "output feature". Also, some of the sample screenshot windows seems to...
  4. waterguy

    Holtan Infiltration Method

    Sorry water2004, I completely forgot about Holtan. I had a look in my copy of the "Handbook of Hydrology" (Editor- David R. Maitland) and it has a one page explanation of the equation parameters and a couple of tables with typical parameter values.
  5. waterguy

    Holtan Infiltration Method

    Are you sure you don't mean the Horton method ?
  6. waterguy

    Need HEC-HMS Assistance

    Ia = (0.2)x(S)
  7. waterguy

    Depth of Flow in a Conduit

    I agree with the others....use Excel to your advantage. You might also consider looking through some hyraulics textbooks to find a partial flow graph that will relate your knowns to your unknowns.
  8. waterguy

    Problems with "ultra-rib" PVC pipe?

    Good question. I don't have any particular references or standards to pass along, but in London (Ontario), we have regulary used ribbed PVC for storm sewers. As to why some municipalities may not approve of ribbed PVC for sanitary sewers.... 1. To differentiate the services. If for example...
  9. waterguy

    Stage-Storgae Calculations

    To determine the stage-storage relationship for your basin you can use the average-end area method whereby you determine the surface area at various elevations within the facility, take the average of the areas between adjacent stages and multiply by the distance (elevation difference) between...
  10. waterguy

    What is the best engineering advice you ever received?

    It’s easier to criticize than create.
  11. waterguy

    Catch Basin Hanging Trap / Horizontal Orifice Plate

    David, I too work in Southern Ontario...currently in London, but have worked in Windsor. Anyway, I have been finding recently that more and more municipalities are not accepting the horizontal CB lid orifices for fear that they can be removed too easily. At one time I had information on these...
  12. waterguy

    Stormwater Drainage System Design - Book Recommendation

    Haestad Methods is coming out with a book on Stormwater Management (sorry, can't recall the exact title, but check their website). They are currently taking "pre-orders", but when I corresponded with one of their people a few months back they said it was going to be ready to ship in...
  13. waterguy

    Vector Plots with Excel

    Does anybody know of any add-on tools that expand Excel's graphing capabilities to include the ability to generate vector plots and/or contour plots ? Alternatively are there any other programs (preferrably freeware) that is capable of plotting this type of information ? Thanks.
  14. waterguy

    Topography

    I've never done the surveying myself, but have been a user of the end product, so I will gladly accept any clarifications/corrections on what I write. You have two options I suppose: 1) Give your surveyor a digital copy of your site (existing conditions), and have them import their surveyed...
  15. waterguy

    Good Introduction to Visual Basic in Excel

    drt, In my case, I started out learning VB (just for my own interest) before I ever used VBA in excel. For myself I found that just learning VB went a long way in using VBA because I didn't have to stuggle with the code writing in addition to how to work with Excels objects. At any rate, the...
  16. waterguy

    Any comments on Piping Stress Analysis Software?

    Just out of curiousity, a former co-worker of mine who worked in another department was a user of ADLPIPE. I didn't see ADLPIPE mentioned in the previous posts, so I was just wondering if they were/are a serious "player" in pipe stress analysis ??
  17. waterguy

    Storm Water detention Pond

    m63, what part of Canada are you working in ? If the Municipality or City that you doing the work in does not have SWM design guidelines and criteria, then I would imagine that your Provincial Ministry of Environment would have something (or should).
  18. waterguy

    Help GAMBIT IGES import problems

    I've had some limited experience with GAMBIT and FLUENT, but regarding the multiple vertices at the same location, I believe that GAMBIT has some sort of "tolerance" command that will allow you to consolidate those multiple vertices into one. Regarding the volumes/surfaces...
  19. waterguy

    Liquid Capacity of Gravel Fill

    I am not familiar with "57 stone", but if I rearrange the equation that I use for the design of small infiltration pits, I get: Vstore = (Vtrench * n)/F.S. where: Vstore = storage available in stone filled trench Vtrench = volume of trench (based on gross dimensions) n = porosity...
  20. waterguy

    Catch Basin Downspout/Liner/Insert

    I'm not exactly sure what "polyethylene liner downspout" means either, but could they be referring to a GOSS TRAP ? It's not a liner, but simply a device on the catchbasin outlet.

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