tag:blogger.com,1999:blog-1675184707067447729.comments2023-07-12T07:12:04.697-07:00The RAS SolutionChris G.http://www.blogger.com/profile/00354834185663924786noreply@blogger.comBlogger3499125tag:blogger.com,1999:blog-1675184707067447729.post-24561688850824630622020-03-22T01:21:29.627-07:002020-03-22T01:21:29.627-07:00Hi Chris
I am using HEC RAS 5.0.7, initially i had...Hi Chris<br />I am using HEC RAS 5.0.7, initially i had run the 1D model by creating XS's in Rasmapper.After that again i changed the XS's location but reach lengths and river stations are not getting updated. please help me in this regard.<br />Thank youAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-4321845978548760652020-03-16T05:44:16.060-07:002020-03-16T05:44:16.060-07:00Hi,
My name's Isabella, I'm Brazilian and...Hi,<br /><br />My name's Isabella, I'm Brazilian and be working Dambreak analyses with Hec-Ras.<br />I would like to learn more about controller, I don't know well languages programation, I've some difficulties to understand. The book appear so good and I believe that will help me a lot.<br />There are some way to dalk about? Because the cost is high for me in moment, I'm in master and need do defend in one year. Thanks since.<br />IsabellaAnonymoushttps://www.blogger.com/profile/13085882199870749374noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-37581069815467805292020-02-22T01:58:58.568-08:002020-02-22T01:58:58.568-08:00Pls am Having d same problem when using hecgeoras ...Pls am Having d same problem when using hecgeoras whenever m running the flood delineation from raster it's displaying object reference not set to an instance of objectAnonymoushttps://www.blogger.com/profile/09210056404657836576noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-40317104824582374382020-02-21T10:34:28.565-08:002020-02-21T10:34:28.565-08:00You might have to just delete the structure and re...You might have to just delete the structure and redo it (making sure to draw from left to right, looking downstream). Seems redundant, but I've had to do this before to get past this error message. Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-37519208223193967072020-02-21T10:30:42.369-08:002020-02-21T10:30:42.369-08:00You have to get into the folder and manually delet...You have to get into the folder and manually delete the files you don't want. Be careful not to delete files you DO want!!! Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-87296770678166947472020-02-20T09:06:02.015-08:002020-02-20T09:06:02.015-08:00Hello I keep getting the same error:
There ...Hello I keep getting the same error: <br /> <br />There is an inconsistency on the information about flow direction over this structure. The positive flow convention for a structure is for stationing to increase going from left to right while looking downstream (like XS's). The centerline's direction is opposite what would be expected from the user entered 'From' and 'To' connected storage areas (or 2d flow areas). To fix this problem, you need to either:<br /> Swap the 'From' and 'To' connected storage area (2d flow area) names.<br /> or<br /> Reverse the centerline stationing (and likely the weir profile data as well).<br /><br />I tried both these fixes and I still get the same issue. HelpAnonymoushttps://www.blogger.com/profile/14784032388074520987noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-3717926982195415072020-02-19T13:34:17.716-08:002020-02-19T13:34:17.716-08:00Hi Chris,
Thank You for the posts. I have generat...Hi Chris,<br /><br />Thank You for the posts. I have generated 100 year flood plain in HEC RAS and want to export this floodplain boundary lines as shape file into Civil 3D. Is it possible? What's up with .db file?<br />Thank You.<br />ShankarSGhttps://www.blogger.com/profile/16264510920295645728noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-26202831076701706182020-02-14T08:46:28.522-08:002020-02-14T08:46:28.522-08:00Hi Chris,
Nice post to explain the files types. I...Hi Chris,<br /><br />Nice post to explain the files types. I am wondering what's the easiest way to delele all the files asscoiated with a plan? I thought deleting the plan will delete the associated files too, but apparently it didn't. I have deleted many plans, but still have all the associated files which I want to delete. I just want to keep the files that are associated with final 3 plans I want to keep. How can I do that?<br /><br />Thanks,<br />ManoManonoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-10574096756612076812020-02-13T10:01:29.535-08:002020-02-13T10:01:29.535-08:00Here is a great reference for n in steep channels....Here is a great reference for n in steep channels.<br />https://www.fs.fed.us/rm/pubs/rmrs_gtr323.pdfkphttps://www.blogger.com/profile/03134001577936554177noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-11501054768512223832020-02-12T16:54:12.556-08:002020-02-12T16:54:12.556-08:00It basically treats the lateral structure as if it...It basically treats the lateral structure as if it were a series of cell faces, then it solves the 2D equations across those faces. The water surface elevation in the "cell" on the 1D side of the faces is determined by interpolation between the cross sections. If you use the 2D equations, instead of the weir equation, the weir coefficient is not used. 2D equation usually works better when there is a high degree of submergence on the weir, or if there is not weir at all. Weir equation usually works better when there is a defined elevated structure represented by the lateral structure (e.g. a levee or dike). Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-3665621964628401232020-02-12T16:20:02.347-08:002020-02-12T16:20:02.347-08:00What does it mean to use the 2D equation option wh...What does it mean to use the 2D equation option when one side of the lateral structure is 1D cross-sections? Along the same lines, if there is a breach in the lateral structure, one must specify a breach weir coefficient. How is that weir coefficient reconciled with a selection of using the 2D equation to represent the lateral structure? <br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-76250441583037336142020-02-12T07:47:50.252-08:002020-02-12T07:47:50.252-08:00Unfortunately, you'll not have much success tr...Unfortunately, you'll not have much success trying to do that in HEC-RAS. All linked files are stored relative to the project directory. In other words, as long as the files from the project directory deeper have the same path, you're good. Outside the project directory, the linking won't work. That is why I suggest to folk that they keep everything in one project directory. Inside there, you can have separate folder-for example, I'll usually have one for GIS and one for Terrains, then RAS will create output folders if I make any stored maps. That way, when you have to share your project, you just zip up the project folder and you can be certain that everything will be there for the recipient. Of course, this means sending bigger zip files, then if say the terrain was stored and accessed from a shared network. But...unfortunately, that's the best way I've found to do this. Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-89059077310321232712020-02-11T15:35:32.860-08:002020-02-11T15:35:32.860-08:00Chris,
I have been running models on my local dri...Chris, <br />I have been running models on my local drive and then copying them over to our network drive. However, when I or someone else goes to open the files on the network location the terrain, manning's, and projection files are all missing because they are still mapped to my local drive. Is there a way to resolve this issue (i.e. store relative pathnames option such as in GIS) so that the files stay linked together. I have not noticed this previously but have been running into this issue recently. Also, having the same issue when trying to send someone else such as client a model. <br /><br />Thanks,<br />Clark Clark L.noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-57359285414172180052020-02-11T14:47:01.419-08:002020-02-11T14:47:01.419-08:00Randy, this could be tricky. You can't have &...Randy, this could be tricky. You can't have "holes" in a 2D area, so you would have to have at least 2 2D areas, one on each side of the reach with bridges. By this time, you might as well just do a 1D reach for the main channel, and then everything out of the main channel is a 2D area. Like I did here in this blog post http://hecrasmodel.blogspot.com/2020/02/1d2d-offline-connection-issues.html <br />This will allow you to model the bridges in 1D, but not have all of those 1D/2D inline connection that can cause trouble and at least really slow down your model.Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-75716808115114956782020-02-11T10:14:44.047-08:002020-02-11T10:14:44.047-08:00Chris, I am attempting to use the 1D/2D approach f...Chris, I am attempting to use the 1D/2D approach for a highway design project. The area has a very wide shared floodplain with continuous overtopping and multiple bridge crossings. Our approach is to model it with a single 2D area with no bridge structures, then calibrate a 1D/2D model to closely match the overall 2D result. The 1D/2D model is essentially full 2D with little 1D "islands" connected via the upstream and downstream cross sections and lateral weirs through the bridge structure. Do you have any objection or cautionary thoughts on this approach?Randyhttps://www.blogger.com/profile/10360200035186986876noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-51718719098961920712020-02-08T07:00:49.980-08:002020-02-08T07:00:49.980-08:00Hi John. In the river, definitely keep your bound...Hi John. In the river, definitely keep your bounding cross sections parallel to the bridge. Out in the floodplain, where you go from parallel to the roadway approach to perpendicular to flowlines will depend a lot on the terrain, the degree of skew of the flowlines to the roadway. Generally, if the skew is quite low (<20 degree approx), I'll keep the cross section parallel to the roadway approach. More than that, I'll generally bend the cross section back to being perpendicular to the downstream flow direction. This is definitely a very subjective exercise. There is no "right" answer. But just keep a couple rules in mind and try to stick to them as much as possible.<br />1. Draw cross sections perpendicular to flow lines. This may require you to dogleg your cross sections if the flow lines are not parallel with each other. <br />2. Keep your bridge bounding cross sections parallel to the bridge deck. Skew the bridge deck and bounding cross sections if they are not perpendicular to the flow lines.<br />Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-30579078894416142602020-02-07T20:52:25.343-08:002020-02-07T20:52:25.343-08:00Hello,
First of all I would like to thank you for...Hello,<br /><br />First of all I would like to thank you for this blog, it helped me demystify the meaning behind a lot of the HEC-RAS capabilities and guided me in correcting and fine-tuning my first simulations. But I am still new to HEC-RAS and I have a problem to solve, one that I do not know how to approach. I am trying to simulate a bridge to be built on a bend of a stream. The problem is that the bridge is also on a road bend, exactly at the intersection with the stream. So there are two intersecting arcs, I am puzzled how to draw my cross sections in order to define the bridge piers. Should my cross sections be arcs parallel to the road – bridge arc? Or is this not acceptable? If my cross sections are straight lines perpendicular to the stream centerline then I cannot define exactly the piers beginnings and ends. The bridge is to have 3 piers and the cross section is going to be a two stage river channel. I will try to provide pictures as an example.<br /><br />https://drive.google.com/file/d/1P-pfwI_d0kbPUqxiK-Ag6e0w96CCbqPc/view?usp=sharing<br /><br />https://drive.google.com/file/d/1WFsYLfWQrkgbMLqdvhBNPduhor3-K5he/view?usp=sharing<br /><br />Also, I have run the simulation in HEC-RAS with arced cross sections and I get the following messages and notes for various cross sections but specifically for the one at the bridge:<br /><br />“The velocity head has changed by more than 0.5 ft (0.15 m). This may indicate the need for additional cross sections.<br /><br />The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7or greater than 1.4. This may indicate the need for additional cross sections.<br /><br />The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross section. This may indicate the need for additional cross sections.<br /><br />Multiple critical depths were found at this location. The critical depth with the lowest, valid, energy was used.”<br /><br />I can add extra cross sections at the other parts of the stream but not in the bridge area, is there any way to overcome that and have HEC-RAS solve it without warnings?<br /><br />Any help would be greatly appreciated.<br />JohnAnonymoushttps://www.blogger.com/profile/14255007796687282802noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-56693882083339361902020-02-05T14:32:20.511-08:002020-02-05T14:32:20.511-08:00The presentation material would be great Chris! Wi...The presentation material would be great Chris! Wish I could go.. but I have a distance problem heheheWellmanhttps://www.blogger.com/profile/04325907386670941741noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-69151869345229832172020-02-04T23:58:50.294-08:002020-02-04T23:58:50.294-08:00It will be very hard for me to be online at that t...It will be very hard for me to be online at that time (here in France it will be 02:30 AM !!!)...Stephane Gaijihttps://www.blogger.com/profile/17912058397492148707noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-4732704607800058392020-02-04T13:52:01.465-08:002020-02-04T13:52:01.465-08:00Sounds like a file is stuck open in the background...Sounds like a file is stuck open in the background process. Try saving RAS, closing RAS, then rebooting your computer.Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-4381736619489874242020-02-04T13:19:39.647-08:002020-02-04T13:19:39.647-08:00Hi Chris, I have a situation where I have to do a ...Hi Chris, I have a situation where I have to do a no-rise analysis for a bridge which is bounded by dam upstream and downstream about 800 feet either sides. Can you please suggest what is the best modelling approach?Anonymoushttps://www.blogger.com/profile/10167331657287238215noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-70059508529250029322020-02-04T07:57:24.556-08:002020-02-04T07:57:24.556-08:00I have been having problems with the simulations, ...I have been having problems with the simulations, every time i try to simulate the steady 1D model, it gives me an error saying the result file already exists. I have delete the result (plan file which is .p01 for example) file manually to get the modelling and repeat the process every time i have to run the model. <br />Do you know what might be causing this?Anonymoushttps://www.blogger.com/profile/08830292379297790892noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-58295788564505070992020-02-04T05:07:05.267-08:002020-02-04T05:07:05.267-08:00This may be an excessively large model in its curr...This may be an excessively large model in its current form. But another suggestion is to refine the mesh region adjacent to the cross section. If the LOB and ROB are connected to the same 2D mesh this can be done by simply drawing a full closed polygon around the region. If the LOB and ROB are NOT connected to the same region the mesh must be refined into 2 different override regions. You will notice once this is done the 1D connection to the 2D cell will be much closer in elevation then prior, this helps in the transfer of runoff from XS to cell. I understand your issue here, just giving alternative advice for anyone reading. Thanks!Luis Partidahttps://www.blogger.com/profile/01824766953730158483noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-31940336566289399252020-02-03T16:43:55.058-08:002020-02-03T16:43:55.058-08:00Hi Chris
I'm having this problem with versio...Hi Chris <br /><br />I'm having this problem with version 5.0.7 where I get HDF error. This is relatively new. It's even happening on projects that I have previously successfully run. Is it possible updates to my machine might have caused this? <br />What's the best way to fix it? <br /><br /><br />hdf_error trying to use hdf output file subroutine hdf_q2d_write_real +time window: 30jan2020 2400 31jan2020; iter= 0Bonifacehttps://www.blogger.com/profile/14961972934657508463noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-54127580680133031992020-02-03T14:10:06.548-08:002020-02-03T14:10:06.548-08:00Good day all
I'm at the end of my wits trying ...Good day all<br />I'm at the end of my wits trying to resolve this error: <br /><br />hdf_error trying to use hdf output file subroutine hdf_q2d_write_real +time window: 30jan2020 2400 31jan2020; iter= 0<br /><br />I only just started experiencing it on version 5.0.7<br /><br />I've looked at various blogs where people experienced a similar problem, but none of the fixes seem to work. <br /><br />What causes this error? <br />I have four culverts in the model <br /><br />Any idea/fix/hack would be highly appreciated <br /><br />regardsBonifacehttps://www.blogger.com/profile/14961972934657508463noreply@blogger.com