Very nice! Just a question, how can you configure manning's n values for the surfaces of these obstructions (wall, house, etc.) you are creating with this methodogy? Because I would think that in your example HEC RAS assumes it is the same manning as the river bed.
It is better to use try & error method with different scenarios, otherwise you can just use mathematical equations to obtain the necessary culvert diameter (or if your diameter is already determined, number of necessary culverts).
Hi, I am working on GLOF. Can you please let me know how to modify the terrain to represent it as a glacial lake under 2D flow area unit given the lake area and volume only?
Hei, I am not sure we can model in HEC-RAS a GLOF in 2D. I would estimate by other methods the hydrogaph in the lake after the outburst and I would set this as bc in hec-ras.
Bonjour, j'ai un problème sur hec ras quant je convertira un levé topographique réal vers un DEM puis quant je crée terrain sur ras mapper je trouve une déférence des altitudes entre le levé initial et le fichier créé par ras mapper, merci.
Very nice and useful the "copy/past" .shp features tool for terrain modifications! Thank you! Have you ever tried with Z.Shape.shp 3D features? [es. extracted from feature lines by C3D design corridors] Can't wait to try it! Bye!
Ana, you're amazing. Keep going!! Your work is fantastic. From Brazil.
You are a great teacher of Hec-ras and would like to be your student. Thanks so much
Hi Ana - just a word of thanks - you are inspiring and enlightening :-) :-)!!
Excellent video!! Keep the good work!
👍Thanks a million
Awesome movie ;)
Thank you for sharing.
Very nice! Just a question, how can you configure manning's n values for the surfaces of these obstructions (wall, house, etc.) you are creating with this methodogy? Because I would think that in your example HEC RAS assumes it is the same manning as the river bed.
Thank you! Yes you can define a different roughness for the different areas separetly. From the geometry, you can select manning-> calibration regions
thank you for sharing this, i learned alot from you
Thank you ...
I have a question, how would someone know how many culverts one would need to place in order for flow not to be disrupted or water overtopping ?
It is better to use try & error method with different scenarios, otherwise you can just use mathematical equations to obtain the necessary culvert diameter (or if your diameter is already determined, number of necessary culverts).
Hi, I am working on GLOF. Can you please let me know how to modify the terrain to represent it as a glacial lake under 2D flow area unit given the lake area and volume only?
Hei, I am not sure we can model in HEC-RAS a GLOF in 2D. I would estimate by other methods the hydrogaph in the lake after the outburst and I would set this as bc in hec-ras.
Bonjour, j'ai un problème sur hec ras quant je convertira un levé topographique réal vers un DEM puis quant je crée terrain sur ras mapper je trouve une déférence des altitudes entre le levé initial et le fichier créé par ras mapper, merci.
Do you have an idea how to create a uniform lower elevation, such as creating a pool of limited depth and area at river section?
Hi Joko, I would draw a polygon using the contour lines and then set that polygon to a given elevation. I think that could work.
Very nice and useful the "copy/past" .shp features tool for terrain modifications! Thank you! Have you ever tried with Z.Shape.shp 3D features? [es. extracted from feature lines by C3D design corridors] Can't wait to try it! Bye!
I have not tried but surely a good idea to check !
please how can i download the DEMs