tag:blogger.com,1999:blog-1675184707067447729.post4340912647586870974..comments2023-07-12T07:12:04.697-07:00Comments on The RAS Solution: Tuesday Tip of the Week–HTAB Headwater Maximum for BridgesChris G.http://www.blogger.com/profile/00354834185663924786noreply@blogger.comBlogger15125tag:blogger.com,1999:blog-1675184707067447729.post-38525432005171485612019-01-16T15:51:36.016-08:002019-01-16T15:51:36.016-08:00Solved this... gotta love this one... a new joy ...Solved this... gotta love this one... a new joy found with HEC.<br /><br />You must do the following:::<br /><br />1) update the Htab parameter "head water maximum elevation" to the desired elevation<br />2) run your "geometry preprocessor"<br />3) go back into htab curves for that culvert/bridge<br />4) click "get defaults from htab" (I would have thought clicking this button would generate the curves from the Htab parameters entered... rather... it is sourcing the solution from the preprocessor).<br /><br />Aaronhttps://www.blogger.com/profile/10217033231342944977noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-20470268820999892932019-01-16T15:03:49.481-08:002019-01-16T15:03:49.481-08:00Thank you for your nice write-up. These are good ...Thank you for your nice write-up. These are good practices.<br /><br />Regarding this, we are having a bug issue (with 5.0.4 at this point) where our Htab curves do not update based on the Htab parameters entered. In our case, it is at a culvert crossing (similar to bridges) but does not update in the same manner.<br /><br />Note: the GUI for the culvert has a button "Get parameters from Htab..." rather than a "refresh" button. When this is clicked... it re-draws the Htab curves but it is always only drawn to the maximum elevation of the culvert/road deck and not the "Head water maximum elevation".<br /><br />...trying with a fresh installation of 5.0.5.Aaronhttps://www.blogger.com/profile/10217033231342944977noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-32317692873047146432018-07-03T02:31:36.254-07:002018-07-03T02:31:36.254-07:00Hello, I'm new in HEC-RAS and I have troubles ...Hello, I'm new in HEC-RAS and I have troubles with steps in water stage and undesired bank overflow especially in areas with bridges while performing steady flow model. Current goal is to keep water in channel.<br />I have a reach that splits and join back to the main river channel. Boundary conditions at start and end of the reach where calculated (not observed data). I have tried to change the "n" values in the channel, and High Flow Method (Bridge Modeling Approach Editor), but no results.<br />Any proposed ideas would be highly appreciated.<br />Best regards,<br />NikolAnonymoushttps://www.blogger.com/profile/14825296972548496255noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-34767531278305392332018-07-03T02:31:24.172-07:002018-07-03T02:31:24.172-07:00Hello, I'm new in HEC-RAS and I have troubles ...Hello, I'm new in HEC-RAS and I have troubles with steps in water stage and undesired bank overflow especially in areas with bridges while performing steady flow model. Current goal is to keep water in channel.<br />I have a reach that splits and join back to the main river channel. Boundary conditions at start and end of the reach where calculated (not observed data). I have tried to change the "n" values in the channel, and High Flow Method (Bridge Modeling Approach Editor), but no results.<br />Any proposed ideas would be highly appreciated.<br />Best regards,<br />NikolAnonymoushttps://www.blogger.com/profile/14825296972548496255noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-9035343086545760462018-02-22T08:47:17.777-08:002018-02-22T08:47:17.777-08:00Chris - I am troubleshooting an unsteady dam breac...Chris - I am troubleshooting an unsteady dam breach model and am having a lot of trouble with my Htab curves for my bridge crossings. I have created my bridge deck geometry as simple as possible, specified my max. headwater and max. flow, and winding up with curves that are extremely uneven. When I look at my TW curves they seem to be generating a range of TW elevations (that are above the bridge deck) into a very tight range of flows. Hopefully I explained that well enough for you to provide some expert advice!Maxhttps://www.blogger.com/profile/10273362898786421044noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-77157891416847299762017-10-04T14:31:32.888-07:002017-10-04T14:31:32.888-07:00No apologies necessary. All experience levels wit...No apologies necessary. All experience levels with HEC-RAS are welcome here. There are no dumb questions.Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-44080965371735466222017-10-03T18:47:48.240-07:002017-10-03T18:47:48.240-07:00I apologize if I asked a dumb question, I am new t...I apologize if I asked a dumb question, I am new to the software and I am learning as I go so I was under the assumption that they needed to be similar. Edgarhttps://www.blogger.com/profile/03368881681718888737noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-8529616246647799962017-10-02T08:06:53.448-07:002017-10-02T08:06:53.448-07:00What do you mean by they "don't match&quo...What do you mean by they "don't match"? They don't have to be the same. Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-25254087086410320362017-09-30T20:35:36.533-07:002017-09-30T20:35:36.533-07:00Hello, I am having trouble when trying to create a...Hello, I am having trouble when trying to create a bridge. My problem is that the upstream and downstream cross sections do not match. Would truly appreciate some help, I am working on my Senior design project and am stuck on this problem.Edgarhttps://www.blogger.com/profile/03368881681718888737noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-39627482533883065692017-01-31T12:59:25.538-08:002017-01-31T12:59:25.538-08:00Appreciate the reply Chris. I believe I've so...Appreciate the reply Chris. I believe I've solved it for the most part. In the Bridge Modeling Approach Editor, I changed the High Flow Method to "Pressure and/or Weir". This, as well as a few ineffective flow area tweaks around the bridge, seemed to do the trick.Anonymoushttps://www.blogger.com/profile/11925128566400558758noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-40709288313589309402017-01-31T12:35:23.914-08:002017-01-31T12:35:23.914-08:00Thanks for reading! Htab parameters are only used...Thanks for reading! Htab parameters are only used for unsteady flow. So if you are running a steady flow model, it must be something else. I would suggest looking at a closer spacing of cross sections. Perhaps higher n values would help (if appropriate).<br /><br />Good luck-<br />ChrisChris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-20536571515740624172017-01-31T09:55:21.676-08:002017-01-31T09:55:21.676-08:00Thanks for the great blog Chris. I'm experien...Thanks for the great blog Chris. I'm experiencing the large "steps" in WSE and Energy Grade line in a steady state model. Would adjusting the Htab parameters be applicable in this case, or is it only relevant for unsteady flow?Anonymoushttps://www.blogger.com/profile/11925128566400558758noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-75950917610823861242016-05-19T09:01:49.440-07:002016-05-19T09:01:49.440-07:00Make sure you run the geometric preprocessor first...Make sure you run the geometric preprocessor first. Then you should have a plot to look at.Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-66333653762107549832016-05-19T00:04:55.019-07:002016-05-19T00:04:55.019-07:00Hi,Chris,I'm Leonard. I have a question to you...Hi,Chris,I'm Leonard. I have a question to you~ I want to follow your method to solve the same problem of bridge unstable simulation,but I can't find my "View Hydraulic Property Tables" for Head Water Elevation-flows Curve , my chart is blank (In choosing Type->Internal boudaries),please tell me how to get this plot for Head Water Elevation-flows Curve. Thanks Regards Anonymoushttps://www.blogger.com/profile/05698825952090369739noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-29870400710684862412016-05-18T23:58:28.272-07:002016-05-18T23:58:28.272-07:00This comment has been removed by the author.Anonymoushttps://www.blogger.com/profile/05698825952090369739noreply@blogger.com