Modify terrain in Ras Mapper HEC RAS 2D

Here we show how to create a channel, a wall and a building.

Easy peasy

Ana

[FernandoBMFENI]

Ana, you're amazing. Keep going!! Your work is fantastic. From Brazil.

[hansking]

Hi Ana - just a word of thanks - you are inspiring and enlightening :-) :-)!!

[MohamedYusuf]

thank you for sharing this, i learned alot from you

[hartadilalu]

Did you add 2D flow area before modifying DEM? Because I see there are cells at the DEM modification location area

[woohoohooie]

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.

[peterokitoi]

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 ?

[zakariabenatmane]

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.

[saipriya]

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?

[jokonugroho]

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?

[sergioserra]

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!