Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. darth051

    Fuel Price Indices for Contracts

    The Ontario Ministry of Transportation established a system that on first glance seems to be what you are looking for. Their system is based on some calculated/assumed values for how much fuel is used for various contract activities and a fuel price index based on the average daily cost of fuel...
  2. darth051

    Problems with "ultra-rib" PVC pipe?

    I may be able to shed some light on it... Down here in the Windsor area, it appears that the problem stems not from the pipe itself but rather a couple contractor's who installed it. Basically, it was installed in a similar manner to concrete pipe which requires only minimal compaction of the...
  3. darth051

    Line and grade definition

    Line = Horizontal Alignment Grade = Vertical Alignment Of course, there should also associated items indicating the allowable construction tolerances (ie how much the Contractor can be out without it being "wrong") and how much the Engineer can alter the line and grade in the field without the...
  4. darth051

    Catch Basin Hanging Trap / Horizontal Orifice Plate

    In my area the depth of allowable road ponding on public roads ranges from none for sewer design storm event to a maximum of 300mm (1') for 1:100 Year event. (The sewer design storm is the 1:2 or 1:5 year event depending on the Municipality.) Of course, in practical terms you can only generally...
  5. darth051

    Catch Basin Hanging Trap / Horizontal Orifice Plate

    Unfortunately, an orifice plate on the connector pipe won't work in this situation. The minimum orifice I can use is 100mm (4") due to local standards and clogging issues. If the orifice was placed on the connector pipe it won't restrict the flows enough to create road storage. David Dietrich...
  6. darth051

    Catch Basin Hanging Trap / Horizontal Orifice Plate

    Its a lovely thing called "stormwater management". In my area it boils down to "Post-development peak runoff cannot exceed Pre-development peak runoff". When you restrict the rate at which water leaves the site you need to create storage to contain the water that you are detaining for later...
  7. darth051

    Catch Basin Hanging Trap / Horizontal Orifice Plate

    Hello, I am looking for detail drawings for a catch basin "hanging trap" aka "horizontal orifice plate". To be clear, this is an insert which sits just below the catch basin frame & grate and restricts the flow into the catch basin and thereby forces water to pond on the road. It should be...
  8. darth051

    Open Channel, Partially full pipe flow in excel. Please help!

    It all depends on the situation as to whether flows less than 30% of pipe capacity are "acedemic". In my area everything is flat enough that pipes are often minimum allowable diameter and grade and flows are in the 0-30% range often enough to be an issue. The whole reason for the "actual...
  9. darth051

    Calculating Open Channel Flow in Excel

    There is a similar thread for calculating partially full pipe depths, areas, wetted perimeters, etc. where I have explained how to set up a spreadsheet to handle the calculations. Please see "Open Channel, Partially full pipe flow in excel. Please help!" in this forum...
  10. darth051

    Open Channel, Partially full pipe flow in excel. Please help!

    Sorry its taken so long to respond but I've been in the field/on holiday. Unfortunately I don't have access to the spreadsheets at the moment but here is the basic method: 1) Set up a table for %full depth based on a pipe diameter of 1. Depth increments of 0.01 are what I traditionaly use. 2)...
  11. darth051

    Calculating Open Channel Flow in Excel

    Kate, I just so happen to already have such a spreadsheet in Excel. I set up a table that calculated the flow and velocity in a generic pipe at incremental depths. I then used the lookup function to find the entry in the table with the closest "% Full Flow Capacity" and read off the...
  12. darth051

    adjustable stand pipes / low flow pipes - detention pond

    After rereading the problem statement and the the comments from others it seems to me that rather than looking for an adjustable standpipe you are looking for an adjustable orifice of some kind so that as the expected water level under storm conditions increases you end up with the same outlet...
  13. darth051

    adjustable stand pipes / low flow pipes - detention pond

    Have you considered leaving the standpipe alone and installing a valve or gate instead? Then you could adjust the valve or gate as required. I've seen something similar here with a weir gate that would be raised and lowered throughout the year in order to control the water level in the pond...
  14. darth051

    Maintenance of Traffic Issue....

    The best person to ask about how much space will be needed to do the work is someone who does the work. Call up one of the local contractors you have a good relationship with and ask them how much they'll need.
  15. darth051

    Stage storage question

    Stage-storage in sloped pipes is not the easiest calculation to do. Luckily for me I use MIDUSS for my stormwater designs and analysis and it includes pipe storage as an option and calculates it for me. (As well as parking lot storage and normal storage in ponds.) That said, while MIDUSS does...
  16. darth051

    Structural Engineers contract not signed by client

    Have you considered contacting a lawyer regarding whether you can file a lien against the project? From what I have read/heard in the past, that would be the proper way to proceed in the jurisdiction (Ontario) that I am in. Of course, it would depend on the laws in whichever jurisdiction you are in.
  17. darth051

    Rational C for Residential Developments

    This is why the Rational Method is more an art than a science... As for how to determine a composite C, finding the impervious and pervious areas and working it out that way rather than a "rule of thumb" value is always the best way to go. That said, selecting the individual C values of each...
  18. darth051

    Roof Drain Sizing and Stormwater Sewer Sizing

    The answer is: However the municipality tells you to. The Building Code is a set of MINIMUM standards and the municipality may have higher standards that they wish you to use. A perfect example of that is the municipality telling you which design storm to use for sizing the sewers. I've had...
  19. darth051

    Vertical Alignments to Plan (Land Desktop)

    FH, The "vertical" and "horizontal" alignment I am referring to are the road alignments. In Land Desktop, you define the centreline of the road alignment (horizontal) and then with Civil Design you design the corresponding vertical alignment (crest curves, sag curves, tangent sections, etc.) in...
  20. darth051

    Vertical Alignments to Plan (Land Desktop)

    Hello, I am looking for an easy way to take a vertical alignment and turn it into a 3D Polyline on the plan view. I am running Land Desktop 2004 and while it will do the job using the new Road Output commands, it is a bit of a pain to do that way. I can't figure out how to automatically set...

Part and Inventory Search

Back
Top