Great, Glad you appreciated the video 🙂.

I'd be happy to help if I can. Do you have something specific in mind?

Apologies for the late response. You can't subtract a surface from a solid. You must convert the surface to a solid first, then subtract that new solid from your other solid.

My pleasure.

Hi. Reading your problem it sounds like you are trying to subtract a 3d solid object with volume (The Dam) from a 3d surface object which doesn't have a volume and therefore the two items aren't compatible to perform your request. You should be able to slice your solid with the surface if you have extracted and converted the tin from the civil 3d surface and combined that to form a dumb Autocad surface which can be used to slice solid objects (make sure the surface completely intersects the dam). Otherwise, if you truly want to subtract, then You need to convert your surface to a 3d solid volume by either extracting a solid from the surface if it is a civil 3d surface, or if it is a "dumb" or static surface then you can try to extrude it in a direction to give the surface faces some body. That should allow you to subtract two solids from each other. If that still does not work and you get a Booleen error from AutoCAD then you most likely have one or more imperfections in either one of the objects you want to perform the subtraction with. Imperfections could be anything from vertices not 100% being exactly on the same locations where they should be or you might have very thin gaps or overlapping faces of the items. Double check all the vertices (set in your units options the number of decimal values very high before you do the check (many desimal places)) and then if no issues were found then I'd recreate one object using as much of the adjacent objects vertices/faces to make sure they can line up exactly. If that still doesn't work, try to slice your dam or the surface into multiple sections, then try to subtract the individual parts. That way you should be able to identify where and in which part the error might come from. Hope this helps, otherwise if the options I gave you did not work, feel free to send me the dwg and I'll have a quick look. You can contact me on LinkedIn.

@@altoroos I understood. Thank you very much for the explanation, i did it. This tutorial is very good. I am a student and this is useful for me (PS you may post more videos for us ). Thank you

Thanks, appreciate the comment.

Correct, you will need to have outputs from a hydrology study to feed the flow information to your model. That flow can obviously also be produced by other sources for example discharge from a dam or pump station.

Thanks for the comment. Glad I could help in any way.

Hi Rachel, glad I could help.

لا يوجد أفضل نوع. عادةً ما يعتمد نوع السد المختار على عوامل مختلفة مثل: الظروف الجيولوجية ، المتطلبات الهيدروليكية ، مواد البناء المتاحة ، مهارات مهندس التصميم ، مهارات المقاولين ، المخاطر التي يفرضها الهيكل على مجتمع المصب ، الزلازل في المنطقة ، مهارات موظفي الصيانة ، سهولة الوصول إلى الموقع للصيانة.

@@altoroos انا بشكرك جزيل الشكر على هذه المعلومات 🌹شكراً 🌹

Glad you liked the video and that I could help in some way. The HEC-RAS version I used when I made this video is rather outdated compared to the latest version, although the overall processes are still applicable and you should still be able to get a model up and running. Good Luck and Have Fun.

@@altoroos Thanks a lot....

Yes, but it does not shows the color rump in Autocad......

@@gerryroberts458 hmmmm, did you take the export via QGIS and choose the colors there? Otherwise it will be grayscale.

If you are referring to the legend not showing up then you can recreate a version of it if you dot down the exact RGB colors used in QGIS and simply replicate it in AUTOCAD. But yes, it won't show up automatically.

Hi Rossana, Can you please provide the exact steps you follow to try and export your results? It would help me to help solve your problem.

@@altoroos I state that I already have a floor plan in .dxf format. I imported it to Civil3D. After that, I imported the DTM as a surface and created alignment and sections based on the floor plan. Finally on I exported to HEC RAS ​​by inserting surface, alignment and sections.

​@@rossanasaracino8548 Seems like you are setting up a 1D HEC-RAS model in civil 3D and then try to export the data generated in Civil3D as a HEC-RAS model which you will then take further from within HEC-RAS. Unfortunately my video was not aimed to facilitate that workflow. I'd suggest looking at the following video which sounds more like what you are after. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oacpBLqpDIk.html

@@altoroos ok 👍 thank you!

Hi Ahmed, Unfortunately I don't have access to those files anymore, but it should be easy enough for you to create your own sample files to test some of the concepts in the video. Then apply it to your own project. For future videos I will include links to sample files as it is being requested by a significant number of people.

Hi Lafras, Did you manage to export the contours with elevations? If you did, please share a few bullet-points on how it could be done. Thanks

Alto Roos Nope. Not while using QGIS. I however redone my flood analysis using the River and Flood analysis Module in C3D. This module exports the contours with elevations. But contours exported from HEC seems a lot more accurate. So still working on it.

Hi Hatef, Unfortunately I don't have access to this file anymore. It is rather easy to create your own sample contours and sections to practice with. So I would suggest that you draw a few lines by hand, elevate them and convert it to a surface. The rest is as simple as I've shown it in the video so it should be easy to recreate. Have fun.

Hi Hatef, Unfortunately I don't have access to the files anymore. It should be easy to recreate and enable you to practice without the my exact file. Good luck and have fun.

No Problem. Glad I could help.

Hi. I used photos taken on site to get a feel for the vegetation, terrain and roughness and correlated that to an applicable freesurface flow reference providing typical manning values for similar areas.

@@altoroos when taking the cross sections,what method is to be used in taking the section physically,manual or levelling instrument? also,is each station independent on the other. i mean cross sections taken at river station1 for instance ,is it independent on cross sections taken on river station 2.

@@peteradegbola4508, sections you take should definitely be using the same reference. Generally, The more accurate your survey the better. The actual method used to capture sections does not matter, as long as they are correctly orientated relatrive to each other and are within your accepted accuracy tolerances. I would suggest using an experienced surveyor applying the latest survey techniques that would be appropriate to the area you want to assess. This would ensure that the survey you use for Your HEC-RAS model will be representative of the area being investigated.

Hi Mike, unfortunately I don't have access to those files anymore. You should be able to create your own sample contours and play around with the flows till you have a model that looks sensible.

An easy way is to get a contour image from Google, import it into Autocad, Scale the image appropriately, trace the contours and give them elevations and then you are half way there. It doesn't have to be detailed or accurate to get the work flow sorted out. Hope this helps.

Alto Roos Thanks Alto

Thanks for the comment. Glad you found it useful :)

Glad you liked the video.

Thanks for the comment. This method is very basic but can become extremely powerful once more complex subassemblies are used.

Glad you liked it.

Un barrage temporaire peut être modélisé de différentes manières en fonction de votre cas particulier. Une solution consisterait à utiliser une structure à porte pour permettre à l'eau d'y pénétrer pendant une durée déterminée en ouvrant et en fermant les portes. Cela atténuerait le débit et pourrait donc être temporairement opérationnel. Une autre façon pourrait être d'avoir plusieurs fichiers de terrain. Un pour avant la construction, un pendant la construction avec le barrage temporaire et un après la construction est terminée. Vous exécuterez ensuite le modèle trois fois et utiliserez les résultats de chaque scénario pour simuler l'effet de la structure temporaire. Une autre solution consiste à laisser le barrage temporaire rompre ou à démarrer l'analyse avec un barrage endommagé, à le reconstruire, puis à utiliser le fichier résultant comme fichier d'entrée pour une analyse secondaire dans laquelle la structure temporaire est à nouveau violée pour revenir à l'état initial. Il est difficile de trouver une solution à votre problème sans connaître les détails. J'espère que cette réponse à votre commentaire aide.

This can be done in AutoCAD or the subassembly composer. Your overall goal with regard to what you would like the subassembly to do, plays a huge role in how you would go about making it.

Hi Willy. Unfortunately I don't have easy access to that sort of information anymore. I am however pretty sure that you will be able to find free survey data available on some government websites. Alternatively you can create some data yourself, an easy way would be to bring a map with contours into Autocad as an image or pdf and then you can create points manually on specific elevations or trace the contours. For practice you won't need very detailed data so the manual creation shouldn't take to long. Good luck.

thanks let me do it, in case i may not manage it then you will help. thanks again bro

@@willylangat6596 yes, I will help how I can. Good luck.

i have successful got the points from google earth tcx convertor, excel convertor. now am doing foundation so far everything is cool

thanks

Noted, will see to get a better Mic which isn't so sensitive to the position relative to my mouth.

Hi Dawid, As far as I know it isn't possible to do a steady state flow analysis with a 2D model. It has to be an unsteady flow analysis and therefore to simulate a Steady State in your model you have to assign a flat hydro-graph at a specific flow as an input boundary condition for the entire duration of the analysis time. Then let the analysis run for a time until steady state is reached within your model. The results obtained can therefore be accepted as if it was a steady state analysis since you only look at the results at a specific time-step. I hope this answers your question.

Eng_Aram - assuming you want to create the body of water as a solid to be able to export that to infraworks? If that's what you want to do - Simply create a solid extending above the surface instead of below like I do in my video and slice the "water" on an xy plane on the elevation of your Full supply level. Delete the water you don't want and then you should be left with the "water" as a "Solid" in the dam. I have no experience using infraworks but I see there are multiple videos showing you how to move data between Civil 3d and Infraworks, so I am assuming that isn't the problem. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yxa5dgHBum0.html Does this solve your issue?

Eng_Aram - This is more likely what you are looking for: forums.autodesk.com/t5/infraworks-forum/water-areas-within-designed-dams-and-channels/td-p/3783825 It looks like the issue is your Surface in Infraworks. It seems like there should be a large enough elevation difference between the inside of your dam and the outside. Then you would simply add water like you would normally in Infraworks to the entire extent of the Full Supply Level and then it should display the "Depth" of the water relatively well.

Hi Joseph, Thanks for your comment. I am pleased to hear that it helped you. Feel free to make any suggestions on future videos or questions you might have.

Thanks for the comment. I was thinking about uploading the video in die individual segments to create a series to make the finding of specific tasks easier. Will see to it when I have free time.

Thanks Stephen, I haven't planned any future Videos yet but I might create some to show or explain other details.