Filtering points in Bridge/Culvert cross sections

[rsmith]

I’m working on a HEC RAS model and when I initiate the Steady flow Analysis … I get the message “THE GUI sent a cross section with 79 too many points at river station 4653.657 in reach MFO1_floodway” as the computations begin. The simulation then freezes up and nothing happens.

This cross section is a road/bridge and when I look at the cross section in the Deck/Roadway Data editor there are indeed way more than 500 points .. actually like 2000. I brought the road/bridge cross section into HECRAS from HEC-GeoRas and I ran the cross section point filter and reduced all of the points in my cross sections to 500 points long before I got to this step. Obviously running the cross section point filter did not reduce the number of points in these bridge/road cross sections. Is there a way to automatically reduce the number of points in the roadway/deck cross section, much like what happens with normal “cross section point filter”?

Thanks,

RS

[cameron]

Are you using internal cross-sections for the bridges?

[rsmith]

I used the tools in HEC-GeoRAS to locate and digitize the bridge/road. I did not specifically create internal cross sections however here is a screen grab of the deck/roadway editor that shows the stations and elevations of the up stream and down stream faces of the road.

When I tried to run the steady flow simulator … the processor got hung up at this screen:

Note: The dialog window says there are 746 too many points.

I’m using HEC-RAS version 4.1.0 and HEC-GeoRas 10 for ArcGIS 10

Thank you for any advice/suggestions.

[jadams]

As far as I know there isn’t an automated way to edit the station elevation data from the Deck Editor. If there is I am very interested in knowing how myself. Because of this I still manually tabulate road information in excel and then ctrl+c and ctrl+v it into the editor.

[cameron]

I would just copy the upstream and downstream cross-section data to the internal cross-sections to fix the problem.

[Lonnie A]

If understand correctly it’s the deck elevation that has too many points. What I would do is create a “junk” geometry file and copy/paste the deck points into a made up cross section. Then use the auto point filtering tools on it….then copy those results back into your bridge editor.

[cameron]

I agree with Lonnie. I did not look at the figure close enough to notice it was the bridge editor.

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