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  • Users: Bayou
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  1. Bayou

    Importing Excel file into HEC-RAS

    One of the easiest ways, if you have a few cross-sections, to input (sta,el) data into HEC-RAS is to just copy/paste from excel. You will have to create each cross-section, but the sta,el can entered by using the windows c/p commands. Also, using the tables within the geometry screen is a quick...
  2. Bayou

    A circular culvert feeds into box culvert - how to evaluate in HEC-RAS

    HEC-RAS does not have the capability to properly model this type of crossing - where the pipe shape & size changes. The best method is perform the culvert calculations outside of HEC-RAS, using the downstream data provided by the model. Then manually input the crossing's headloss into HEC-RAS...
  3. Bayou

    HEC-HMS versus TR-20 and HEC-1

    I will suggest that you train your engineers in HEC-HMS. It really isn't that difficult and the stability issues are being worked out by the Corps. Of course RAS had the same issues prior to the version 3 releases. The biggest advantages of HMS is the acceptance of the program by FEMA, USACE and...
  4. Bayou

    Detension Ponds on flat sites?

    I have to ask "why is building the basin difficult"? Of course I don't know the design considerations that you have, but just because the overland is flat doesn't mean that the basin floor has to be as flat. Most communities require some sort pilot channel in the basin bottom as well as...
  5. Bayou

    USGS 7.5 minute Quad maps' datum

    USGS tends to be fairly detailed with their metadata, and typically have the contract provide an associated metadata file within the raster file download package. If no other files came with the image, then try looking at other websites that have metadata listed or allow downloading of the...
  6. Bayou

    HEC-RAS Flood Study

    Usually when a less frequent event water surface elevation is calculated below more frequent event wsel, it is a matter of ineffective flow areas. The program probably calculated that the flow of the 500-yr overtopped the roadway while the 50 & 100-year did not (based on the inputted...
  7. Bayou

    TEXT WITH BOXES

    Is there a text font that has a feature that can place a white (or blank) box around the font. Purpose is to make the font more distinctive on aerial backgrounds. I know that Acad sees the font with a box around it when it is selected within a hatch. I'm looking for something similar. A...
  8. Bayou

    transparent hatching

    How do I make a solid hatch translucent? Acad 2000, 2002, or 2004? I know Microstation and ArcMap can do it; so I'm assuming Acad can to as well. Application: Highlighting an area on an aerial.
  9. Bayou

    Input data from .txt file

    If you are drawing a profile, it may be easier to just put the data in excel. Create a column that combines the x & y into a format of "x,y". This can be done with the concatenate command or a line similar to =A1&","&B1. Copy-clip the column. Inside of Acad start the Pline command, pull up the...
  10. Bayou

    How to display objects on top of a raster Image...

    I tend to keep the display order tool bar on the screen. It becomes a pain, but I haven't found a way to keep the image permanently in the background.
  11. Bayou

    Development In a Flood Zone?

    This may be a little late for you project... When dealing with communities that have floodplain administrators with written regulations, typically you can fill in the floodplain. The fill doesn't have to be "re-distributed" soil from within the floodplain. However, the net fill within the...
  12. Bayou

    detention basin invert elev

    Our local regulations require the pipe invert to be a foot above the bottom of the basin. This will decrease the erosion potential near the pipe. Of course some protection will be needed.
  13. Bayou

    Raster Images

    Occasionally I get the same problem on large aerial plots. My cad guys and I have deduced that it is a memory problem. We've also found that rotating the drawing eliminates the problem most of the time (don't ask why).
  14. Bayou

    HEC-2 Help

    ritrower, first look at an example of a working HEC-2 file. The output for the job cards include descriptions of the variables. The NC card looks mostly correct--don't put a space after the two letters. Also if the column is Zero, then you don't have to enter a zero -- a ,, equals a zero. eg...
  15. Bayou

    HEC-2 Help

    Other tricks is to use a spreadsheet like Excel to input your data, then concatenate the data with commas. This can be copied-pasted into a text file. Then just use free format in the HEC-2 model.
  16. Bayou

    HEC-2 Help

    If it is a message is from EDIT-2 or another program checking the data of your HEC-2 stack, most likely you are entering too many GR points within the same card. GR data is limited to 100 points (safe side use 95-98) per cross-section. However, this can be side-stepped by using X4 cards to...
  17. Bayou

    No impact to FEMA modeled streams

    FEMA rules state that the effective BFE cannot be impacted more 1.0 feet. Therefore a development can fill within the floodplain fringe (the area within the floodplain, but outside the floodway) without imposing on FEMA regulations. However, development cannot occur within the floodway. The...
  18. Bayou

    Xref Binding Problems

    It seems everytime I try to bind a reference file, Acad comes back with an "*Invalid*" and will not let me. Is there a specific setting or way to bring in reference files so that the program will actually bind them. using Acad 2002.
  19. Bayou

    Hourly Lockup?

    Greenwire, This suggestion may be to simple, but one never knows. Since the lockup is hourly, it may be the autosave, especially if you are running large files. Go to preferences and turn the Autosave off.
  20. Bayou

    .DXF FILES

    Autocad treats dxf files fairly closely as it's own file type. 1) Click open like you would normally. 2) At the bottom of the pop-up screen, change the filetype to DXF. 3) Then choose the file. Or you can just double click on the file while in Explorer.

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