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Clark Barlow

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Everything posted by Clark Barlow

  1. You'll might also get this error if your initial moisture is higher than the porosity for a particular soil type. Just something else to check.
  2. Chad- This error usually means that you have a stream segment that has no vertices. Vertices represent computational nodes in GSSHA, and each stream arc must have at least one vertex, or computational node, to run. I'm not sure why the model says you have a negative outlet slope because as far as I've seen, the outlet slope has nothing to do with it. Simply add another vertex to the arc (I usually redistribute the vertices along the arc and set the number of segments option to 2) and rerun and it should work. Clark
  3. Ludek, I agree, this sounds like a bug in GSSHA. I would suggest contacting the model developers to report the bug. You can find their contact info on the GSSHA wiki page: www.gsshawiki.com Thanks, Clark
  4. First of all, you would probably have a better match if you contoured the TIN instead of the DEM. Depending on what resolution you chose when you created the DEM, you could potential lose some elevation detail during the resampling process. Actually, I'm not sure why you needed to create a DEM at all. When extracting cross-sections for HEC-RAS in WMS, you do this using a TIN, not a DEM. So if your extracted cross-sections are a poor representation of reality, there must be something funny going on with the TIN. One thing you could do is turn on the display of TIN triangles. This will show you what the underlying TIN surface looks like and should explain a lot. One possibility is that when converting shapefile contours to feature objects, then to a TIN, if you do not "redistribute vertices" along the feature arcs, the TIN ends up creating long, thin triangles between the contour lines that result in a poor elevation surface. Redistributing vertices is key in order to space out the triangle vertices, but you also want to be careful not to spread them out too far so as not to lose horizontal detail. I hope this helps. Clark
  5. Some of you may have noticed a strange occurrence in WMS where one of the WMS tools (zoom tool, select polygon tool, etc) gets stuck in rubber-band mode. This means even when you aren't clicking and dragging the tool, WMS will draw a selecting box with the tool as if you were! Unfortunately, we haven't pinpointed exactly when or why this happens. We have good news though- there is a workaround! The answer is to simply launch another instance of WMS from the start menu. Once WMS opens, close the WMS window and once you're back in your original project, you'll notice the rubber-band line is gone. If I were you, I would then save my project, and continue working as before. Good luck! Clark
  6. Hi Lily, We are aware of the new version of CE-QUAL-W2. We have not yet tested this version for compatibility with WMS which is why we don't yet distribute it. We expect to make this evaluation sometime in the near future. Clark
  7. Lily, I use WMS 8.3 on a Windows 7 machine and I don't seem to have any problems related to compatibility with the OS. Is there a reason why you need to install CE-QUAL-W2 separately? CE-QUAL-W2 version 3.2 and 3.5 get installed in the WMS folder when you install WMS. I've never had a problem doing this. Are you trying to install a newer version of CE-QUAL-W2? Please provide more information so we can better understand your problem. Regards, Clark
  8. Shiva, If you're not using the rainfall grids to derive a basin average rainfall depth, it's hard to say what the problem might be without looking at your model. What other processes are you trying to model? Have you tried sending the model to tech support? Clark
  9. Shiva, Your document suggests that you're using radar rainfall. Is this so you can derive a basin average rainfall value, or are you using the radar rainfall grids to distribute rainfall over the watershed? Clark
  10. Thomas- You can do this in WMS. It involves editing the DEM elevations using an arc. See our online help page for more info: http://www.xmswiki.com/xms/WMS:Editing_DEM_Elevations -Clark
  11. Thomas- Yes, you could do this as well. The only drawback to this method is that it often creates a very abrupt transition between the overland area and the stream channel, creating artificially high slopes along the stream bank. This can throw off some of the parameters WMS computes for the watershed, such as mean basin slope. But if all else fails, you could try this, particularly if the model you're running doesn't depend on the slope-related parameters. -Clark
  12. You have a couple options. You could turn on your flow vectors and adjust them around your area of interest until you get the stream to show up. You do this by double clicking on a DEM cell and changing the flow direction arrow. Another option is editing the DEM elevations. For example, if you have survey data of the area, you could merge that with the DEM in hopes of TOPAZ defining the stream in that area correctly. I hope that helps. Clark
  13. Rob, I haven't used flow change locations much in unsteady flow. It seems though that if the tributary enters the main stem after your flow change locations, then the flow change should be entered simply as the total flow at that point. If the flow change locations occur downstream of the confluence, then you would also have to account for the tributary. I have a good feel for how this all works in steady flow, but again, not really for unsteady. I don't know that this affects your boundary conditions. It seems that if you use a flow time series upstream (on both the main stem and the trib), and normal depth for the ds boundary conditions (on both the main stem and the trib) that this should work fine. I guess I don't see how your boundary conditions would be affected by the flow changes. Sorry if this response is completely useless to you. Feel free to clarify if there's something I missed. Thanks, Clark
  14. Rob, Yes, you do need to make sure your flow changes correspond to the event you're trying to run. If you're getting 50-yr flood stages with seasonal low-flow boundary conditions, then it could be that your flow changes are adding way too much flow. You could also fool around with the boundary conditions, e.g., change the ds boundary condition to normal depth and see if that drastically changes your results. Clark
  15. Rob, I'm not sure what could be going on here. Right away, I would suggest lowering the timestep and see if that makes a difference. I would try hourly timesteps and then even a 1 minute timestep if you're still getting errors. If this doesn't solve the problem, I would suggest looking through the unsteady flow troubleshooting chapter in the HEC-RAS user's manual (p. 8-57 "Model Stability"). This has a number of suggestions for things to check to fix the problem (cross-section spacing, computation time step, etc). Sorry I can't be of more help. If these suggestions don't help, you could also send the model to us and have us look at it for you, but that doesn't fall under normal tech support. If it comes to that, let me know and we'll work something out with you. Thanks, Clark
  16. Rob, It's tough to say, there are lots of things that could be going on. You might want to try emailing your files to tech support (support@aquaveo.com) or look over the tutorials to make sure you haven't missed a step. Sorry I'm not much help. Clark
  17. Rob, I'm not sure I understand the problem fully, but right off the bat, I would make sure your cross-section arcs are on a 1D Hyd Cross-Section coverage and that your centerline and bank arcs are on the 1D Hyd Centerline coverage. You can verify this by right clicking on the coverages and choosing type to see what type they are. See if this fixes the problem. Clark
  18. Katie, I used the March 3, 2008 build of WMS 8.0. I'm not sure if the build date makes a difference or not. You could try using the last build of WMS 8.0 and see if that fixes the problem: ftp://pubftp.aquaveo.com/download/WMS/wms80ful.exe -Clark
  19. Katie, It seems to work fine for me. I'm not sure what could be going wrong. You may want to double check your coordinate systems and make sure they are properly defined before you use the tool. That sometimes causes problems. There haven't been any changes to URLs or anything, so that shouldn't be an issue. Clark
  20. Katie, Turn off everything but the coverage you want to export using the toggles in the Project Explorer. Then click File->Save As and change the file type to .shp. It will prompt you to choose what type of shapefiles you want to create. You should only need a polygon shapefile. Clark
  21. Katie, To print, I would choose Edit | Copy to Clipboard and enter a bitmap scale factor of 2 or 3 (creates a higher resolution image) and then paste in Word and print from there. WMS only lets you crop tif files that store cropping information as part of the files. I'm not sure if your files meet this condition or not. The way I usually crop images is by using the "get data tool" and dragging a box of the extent inside WMS and then downloading a new image from the TerraServer. This may or may not work for you depending on how the TerraServer images compare with the high resolution images you have in your project. Patterns are only available for soil type coverages. Land use colors can be changed in the Display Options dialog (Map Data tab, Land Use Display Options), but there is no way to add transparency to the colors. So you have a few options for showing land use polygons with the image behind them. You can choose to display the polygons so that the polygon boundaries are colored but the polygons are not color filled. Or, you can export the land use coverage as a shapefile and manipulate them any way you like in a separate program such as ArcGIS. You could also create a 2D grid from your land use coverage and then create a TIN from the grid and this would allow you to add transparency inside WMS. It's kind of complicated to do, but if the other two options don't work for you, I could walk you through it. I hope this helps. -Clark
  22. Katie, As far as I know, Google Earth won't let you export images that are already geo-referenced, but you can do this manually without too much trouble. The easiest way I know how is to save two images, one with grids turned on and one with grids turned off. Use the image with grids when manually geo-referencing the image in WMS and save out a world file when you're done. Then swap out the image with grids with the image without grids and voila, you have a geo-referenced background image. I hope this helps. -Clark
  23. Katie, Your coordinate systems could be off, but it looks to me like the land use data you got just doesn't cover the right area. You might try downloading several land use datasets from the EPA and see if any of them work. If none of them do, you might have to use the approach Chris recommended and create your own land use coverage. Clark
  24. There was an error with this update preventing the WMS executable from being updated. If you downloaded and installed this update before 1:00 PM 28 Jan 2010, you will need to download and install this update again. Sorry for the inconvenience. Regards, Clark Barlow
  25. Rob, I'm not sure what could be wrong without looking at the project. Off the top of my head, you might want to double click on your centerlines and make sure they have the centerline attribute, and that they each have a river and reach name associated with it. You could also double check to make sure your TIN is triangulated. If that doesn't work, you could try zipping and emailing your project to our support team (support@aquaveo.com). Good luck, Clark
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