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...
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...
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...
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...
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...
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...
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...
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.
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...
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...
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.
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).
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...
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.
