Hello, I am pretty much quite new to 2d modelling using HECRAS. I have gotten quite the hang of the tools as I am developing my 3rd model from scratch.
In my current model, I am using a 0.2x0.2 raster resolution terrain (created by combining detailed survey data for channel and bridges + a general terrain file using Civil3D) and a mesh of 10x10 with breaklines varying from 0.5, 1 and 2.
I have been playing around with this configuration of my cells but I have taken note of the common errors I am having every unsteady flow run I did so far. This occurs obviously in parts where there are high grounds. I have been viewing the HECRAS resources (manuals, videos, etc.) and found in one of their workshops that somehow a course terrain would do depends on the goal of making the model. The goal for my models is to check the inundation scope and use the initial output as reference to model the proposed solutions to minimize the flooding.
So, to make my modelling workflow to be efficient, because honestly the iterative process of this plus the time pressure to produce the output from the model to show to clients is killing me. Without someone mentoring me is torture too
I am thinking, should I just importing the raster files separately in to RASmapper to let it stitch it together there, or continue creating the base terrain in Civil3d and clean this by using terrain modifications? I used it a couple of times and the edges seems more forgiving when generating cells through breaklines but not entirely error free. And also, is the 0.2x0.2 resolution terrain too detailed and mainly causing this frequent error as the cells contain these terrain data too due to the subgrid tech HECRAS is using?
I am humbly asking for expert and experienced opinion about these. no one in the office can mentor me on this as they depend on me to do this stuff for their project.
I included some screenshots in my model for reference. Thanks everyone!