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  1. saruman26

    HY-8 and Multiple Culverts

    Update on this post. I created a new HY-8 file and entered the data anew. This time, I get the same W.S.E. for both culverts. Now it appears to work. I stumbled upon a similar post here from 10/2008 where the user had the same problem. Perhaps an odd glitch in the coding? Thanks in advance...
  2. saruman26

    HY-8 and Multiple Culverts

    I am getting an odd error in HY-8 when analyzing multiple culverts. My situation is this - a new road crossing, with two arch RCP pipes. The first is a 62x102 with the invert buried into the stream bed 12". The second pipe is a 54x88 with the invert at the stream bed elevation. When running...
  3. saruman26

    ACAD Civil 3D 2009 Pipe Module

    Does anybody have or perhaps know where one could find a Civil 3D pipe library (the parts lists and XML files) for corrugated metal pipe, corrugated metal arch pipe, and concrete arch pipe? These materials are not in the standard library and I am looking to see if anybody else has created any...
  4. saruman26

    Permanent Sediment Control for a Huge Dirt Lot

    I'm surprised that the local soil conservation district or environmental quality department would allow a permanent dirt lot. Here in Pennsylvania, this lost would have to be vegetated or completely covered in gravel. This situation may produce too much sediment for a hydrodynamic separator...
  5. saruman26

    stormwater energy dissipator for steep slope

    Oops, typo on my part. That should read 2.5%. As for the potential for orifice flow, that's a good question. Without running a hydraulic model, I'd guess that orifice flow would be a greater concern if the pipe is surcharging a bit. Perhaps I'll try to model such a system in StormCAD if I...
  6. saruman26

    stormwater energy dissipator for steep slope

    Accidentally hit 'submit' I've worked on a similar situation before, though with smaller pipes and lesser flows. In this case, it sounds like to have adequate space to do two drops in the new run of 60" RCP. This will likely require at least an 84" inside diameter manhole to accommodate the...
  7. saruman26

    stormwater energy dissipator for steep slope

    I've worked on a similar situation before, though with smaller pipes and lesser flows. In this case, it sounds like to have adequate space to do two drops in the new run of 60" RCP. This will likely require a
  8. saruman26

    Gravel Parking lot

    A good rule of thumb is to have the minimum grade set at 2% - the same ideal used for vegetated channels. That allows a little wiggle room if the grade only comes to 1% or so. As for protecting the storm sewer from sedimentation, a grass swale or grass filter strip is a good way to go. A...
  9. saruman26

    stormwater energy dissipator for steep slope

    Is this an open channel or closed conduit (i.e. pipe) flow condition? A stepped approach with pipes/channel at slopes less than 5% or so and a few vertical drops in the system may help to reduce velocity while still providing adequate capacity.
  10. saruman26

    100 yr flood in HEC_RAS

    Sounds like a hydraulic jump, which isn't uncommon. If the model is set correctly, this probably means that there isn't enough capacity to convey the 100-year storm event. As for including the rail, I don't know, but if the goal is to prevent overtopping, use the lowest elevation part to...
  11. saruman26

    Artificial Turf- Runoff Calculation

    100% runoff (CN=98 or Rational C=0.95), with a Tc based upon the travel time through the discharge pipes to the detention bed. And don't, don't, don't use the area under the field as the detention facility. This may cause the field to float during rainfall events. You want the facility to...
  12. saruman26

    Roof Infiltration Hydrology

    Let's simplify. Does the municipality or state have a target treatment volume, i.e. 2" of runoff? If so, then this is easy. To determine the volume of runoff to be managed, multiply the roof area (square feet) by the rainfall depth (in inches), then multiply by 1/12 to covert to cubic feet...
  13. saruman26

    Adobe Acrobat Distiller

    CutePDF is a great option. A free basic version can be downloaded from their website (www.cutepdf.com).
  14. saruman26

    what's the difference between the DTEXT and MTEXT command in AUTOCAD?

    The express toolbar also has a utility for converting text to mtext.
  15. saruman26

    Parking Lot Grade Breaks

    In general, keep the net (algebraeic) difference between the two grades at around 10% or less.
  16. saruman26

    Quick Hydraflow Question

    My only answer is: That's just the way the software was written. To work around that limitation, I will add two combinations of less than 6 hydrographs, and then combine the two combinations into a single output hydrograph. To simplify my explanation, let's say that I need to combine 8...
  17. saruman26

    storm pipe design question

    Most round pipe sections have an 'equivalent' elliptical section that is of similar (probably not exact) capacity and flow area that will do the same job, but can be more useful in some circumstances.
  18. saruman26

    How to get the length of a spline

    The lenght of a spline can be found using the 'list' command - it's one of the properties listed in the pop-up dialog box.
  19. saruman26

    Plot files

    AutoCAD allows you to make plot files directly from the print command with no extra software needed. Choose File, then Plot (or click on the printer icon, either way you prefer), and under the Plot dialog box, choose the 'Plot Device' tab. At the bottom right there is a check box labeled 'Plot...
  20. saruman26

    storm pipe design question

    Good point, civilperson. A 19"x30" elliptical RCP (24" round equivalent) can easily be substituted here.

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