HEC RAS 2D Flood modelling: Diffusion wave v/s Full momentum

[@Angelo-w3m]

Quite a big difference apparently! How do u chose between them? Thanks for sharing

[@bojet-6165]

Is it necessary to have all the topografy of the land? I mean if I just have topografy of the river, Can I have results of the land inundation? Or there's another method. Thanks. I really apreciatte your videos. Greets from SA.

[@JALAJDARPAN]

Yes,It's mandatory to have topography layer upto project area