Questions tagged [hec-ras]
a standalone program for analysis and modeling of river hydrology, flow profiles, floodplain mapping, and sediment transport
42 questions
2
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Terrain creation error using a GeoTIFF file with HEC-RAS 6.2 - "object reference not set to instance of object"
I am attempting to import a TIFF file created in QGIS, into HEC-RAS. I have a projection file as the SRS definition for HEC-RAS, which is derived from a shapefile that lines up with the spatial extent ...
- 153
0
votes
1
answer
475
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Determining maximum capacity of river using HEC-RAS
Is there a practical way to determine the maximum hydraulic capacity of a river in HEC-RAS?
I would like to know for each cross section of my 1D model what the maximum flow rate will be before ...
- 1,154
0
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2
answers
166
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How can I adjust the vertical datum of cross section coordinates in a spreadsheet?
So I was able to get really detailed lidar cross-sections from this tool, but I am not sure how to make use of it in my model. The vertical datum doesn't seem to match up.
Is there an easy way to ...
- 1
1
vote
0
answers
900
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Imported perimeter values changing in HEC-RAS during further addition of data
I'm new to HEC-RAS and am encountering a very odd problem. I am using the RAS Mapper and import a terrain and then a perimeter feature. I then calculate the grid and save the geometry. Then, I open ...
- 11
0
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0
answers
465
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Creating a Cross section of a river
I am using QGIS and HEC-RAS for my project. HEC-RAS needs a file for the river bathymetry. Since I do not have data for river bathymetry, I decided to use the Profile Tool in QGIS to create a river ...
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0
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0
answers
583
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Shifting HEC RAS cross sections to the side
I was wondering if there is a way to shift a cross section in HEC RAS to the side?
Since my data is not the best, a lot of xs are shifted somehow (see screenshot). The only way fixing it I found so ...
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0
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0
answers
337
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How to convert Geographic Coordinate system to Projected coordinate system INDIA for HEC-RAS without ArcGIS?
The DEM data is downloaded from https://bhuvan-app1.nrsc.gov.in/ website.
I want to use it for HEC-RAS project but it has a geographical coordinate system, how can I convert it to projected one ...
- 101
0
votes
1
answer
464
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Floodplain Delineation using Rasters - ArcGIS/HecRAS
I exported my HecRAS results as GIS format and created from the .sdf file a .xml file with the HecRas extension for ArcGIS.
After that I want to perform
"Floodplain Delineation using Rasters"
...
- 109
1
vote
2
answers
480
views
No plan available - HecRAS
I did an unsteady flow analysis with HecRAS 5.0.7. and want to export my results as GIS - Data. But if I want to select my profile, I got always the same error message
The plan must be executed ...
- 109
0
votes
1
answer
130
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Using HEC-Geo RAS
i have got some weird problems with HEC-RAS 5.0.7. and i dont know why.
Actually the heihgts are complety wrong. My terrain heights are rigth but for example my cutlines are completly useless.
My OS ...
- 109
6
votes
3
answers
3k
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Why transforming .vrt to .tif considerably increases size of raster?
I have a .vrt file that references (i.e. was created based on) five .tif files (whose sizes are 1.3 MB, 2.7 MB, 330 MB, 4 MB and 2.7 MB). These files represent a Digital Elevation Model (DEM), where ...
- 604
1
vote
1
answer
442
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Input parameters not saved in HEC-RAS 5.0.6
I have worked in HEC-RAS before, even in the version I am trying to use right now (5.0.6) but I have never encountered this issue. It seems I am unable to introduce decimal numbers in HEC-RAS, due to ...
- 69
4
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0
answers
503
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QGIS - creating cross section to meet contour line
How can I automate the process of creating a shapefile containing cross-sections of a river centreline that will meet to a set distance given by a contour shapefile?
Is there a plugin or a set of ...
- 119
0
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1
answer
2k
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User-Scaled Color Relief Map to Google Earth from DTM
I have a DTM file, and my goal is to load it up onto Google Earth as a color relief map, with the colors gradient at levels I chose. I have successfully done this with RAS MAP using HEC RAS software, ...
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1
answer
444
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Forcing left to right order of cross section lines of river using QGIS
Based on "Generating a series of cross sections (profiles) along a line?" post, how can I force the cross-section lines to be created, thus collecting elevation data, from LEFT to RIGHT ...
- 119
0
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1
answer
1k
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Assigning XS Cut Line Attributes like River/Reach Name, Stationing, Bank Lines, etc?
I'm working on a flood inundation project as my research study of my course. I am now assigning XS Cut Line Attribute (after constructing the XS Cut Lines) in HEC-Georas > RAS Geometry > XS Cut Lines ...
- 11
0
votes
1
answer
983
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Shifting entire river channel in HEC-RAS?
This question is specific to the HEC-RAS software.
I'm trying to use the software to shift a river channel. I've used the Geometric Data Editor for the Cross Sections to edit the positions of the ...
- 13
7
votes
1
answer
1k
views
What is the schema of HEC-RAS output in HDF5 format?
I realize that HDF5 is a self describing format, and I can use a tool or programmatically find out what types of data groups exist in an HDF5 file.
What I am really looking for are the group and data ...
- 118
5
votes
1
answer
1k
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QGIS: Edit elevation in DTM to get correct slope of a river
I am new to QGIS and just need it to do a hydrolocic analysis of an area of which
I later make a flow model with HEC-RAS 2D.
I made it according to this tutorial: https://www.youtube.com/watch?v=Ro-...
- 51
0
votes
1
answer
2k
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Error creating Terrain in HEC-RAS
I am struggling to produce a terrian file with RAS Mapper.
I have a .tif file produced from a .asc raster elevation and when I tried to add a New Terrain Model as described in the documentation I get ...
- 3,260
-1
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1
answer
454
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Hec Ras Error Message
I am getting this error when I am running unsteady flow analysis.I run geometric correction mesh calculation but still, the error is same.
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1
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0
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51
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Can I determine hydraulic load on river bank with hec-ras? [closed]
I want to calculate the force exerted by wave action on river bank.
If I know the discharge, flow rate and water level, can I calculate the hydraulic load acting on river bank with hec-ras?
If not,...
2
votes
1
answer
934
views
How to fix a broken plugin (it cannot import name NavigationToolbar2QTAgg)
I want to use the the pluging ProfileFromPoints but I am getting an error saying cannot import name NavigationToolbar2QTAgg. The solution seems to link with an old library name as mentioned here: ...
- 3,260
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1
answer
5k
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How to Batch Export HEC-RAS Results Layers
I've created a hydro model in HEC-RAS (ver 5.0.3) and have a separate flow profiles for every day of the year, using the 53-year median flow rate for that day, and under multiple structural scenarios ...
- 3,910
1
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0
answers
177
views
Which geographic coordinate system should I use to work in meters in Angola?
I am using WGS84 in Qgis 2.18, but when I try to use some Qgis Plugins (like Profile Tool and Q-Ras) they don´t work. Is it a coordinate problem? Or something else?
Profile Tool:
It makes the ...
- 49
1
vote
1
answer
2k
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Hec Ras error while processing
I am facing this error while creating a new terrain in Hec RAS ?
Importing 1 of 1: dem_rep.tif
Step 1 of 4: Translating to GeoTiff with SRS...
Error creating Terrain: The system cannot find the file ...
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-1
votes
1
answer
114
views
SAR Flood Depth Mapping [closed]
Is it possible to map flood depth using sar dataset? if yes Which sar data should be used for better result and using which software we can map?
- 25
2
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4
answers
7k
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Filling hole in DEM using ArcGIS Desktop?
How would I fix my DEM because it has holes?
I need to maybe extrapolate from surrounding terrain.
Here is the picture
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0
answers
36
views
Representing channel characteristic data [closed]
I have stream channel cross profiles of a small stream, as well as water depth data from dive loggers we installed the beginning of summer. There is only one dive logger in the stream. I am trying to ...
1
vote
1
answer
666
views
HEC-RAS limitation on cross sections?
For every cross-section profile, Manning's value is assigned.
There are numerous values in a single cross-section profile but HEC-RAS allows only 20 values per cross-section.
How can I deal with ...
- 160
0
votes
1
answer
390
views
Missing files in HEC-RAS 5.0.3
I'm trying to create the files in HEC-RAS 5.0.3, but nothing is created. Even though the location of the project is shown in the main window, I can't find the file in this location. That causes this ...
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0
answers
389
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How to elevate cross-sections in HEC-RAS 5.0.3?
Then creating the cross sections in HEC-RAS it appears that all of the cross sections are in the same elevation. I have tried to change each elevation then creating each cross section, but I get ...
- 11
0
votes
2
answers
2k
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Flood Inundation Mapping In HEC-RAS?
I'm getting this output as a result of discharge values while doing flood inundation mapping.
In some areas there are breaks as indicated by red arrows.
If this result is correct what would be the ...
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-1
votes
1
answer
300
views
Exporting complete river profile from hec-ras into ArcMap?
Whenever i import the data from hec-ras the result is the same, what mistake am i making here?
- 31
0
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1
answer
5k
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Hec-Ras 5.0: Adding aerial imagery to geometric view
I'm having trouble displaying an aerial imager in the HEC-RAS geometric view in version 5.0.1. I've added the aerial, a project TIF file, to the RAS Mapper and it shows up without issue. When I go to ...
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1
vote
1
answer
322
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DEM ASCII for HEC-GeoRAS
I have a hard time understanding what ASCII files are. I have this DEM in asc. I try to import them into ArcMAP 10.3 and they appear in my naked eyes as images however what I found on internet is ...
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0
votes
1
answer
561
views
How to convert floodplain inundation results from a Hec-Ras model into Google Earth?
Having run a Hec-Ras 4.1.0 model, I wish to show the results in Google Earth. How is this possible and is it possible to do this by using ArcMap 10.1?
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1
vote
1
answer
1k
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Unable to delineate inundation map from HEC-RAS to Hec-GeoRAS?
I am trying to delineate the flood map generated from HEC-RAS by importing them into the HEC-GeoRAS. However, I got this error:
How will I resolve this?
- 469
4
votes
1
answer
8k
views
Can QGIS open a SDF file created by HEC RAS?
I used the "export GIS data" option in HEC RAS and got a SDF file.
Is it possible to open it in QGIS?
- 1,019
5
votes
5
answers
9k
views
Is it possible to export cross sections from QGIS to HEC-RAS
Is it possible to create cross sections along a river in QGIS and then export the data to HEC-RAS?
- 1,019
3
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2
answers
470
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Determining steady flow in HEC_RAS 4.0
While using HEC-RAS 4.0 Beta, how to set PF1 in Steady Data Flow?
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2
answers
3k
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Converting Easting, Northing, and Elevation to Station and Elevation
How can I convert x,y,z (easting, northing and elevation) data into station and elevation? I am trying to input the data into HEC-RAS, which only takes station and elevation.
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