Dear Luis Partida,
Hope you are doing well
I am also trying to model the backwater effect due to a dam in the downstream of main river and a river junction where tributary is joining to main river. When I run the simulation, I run by using full momentum equation and diffusion wave equation for 2D mesh. I did see the WSE more in the case when full momentum equation was used than diffusion wave. I concluded or assumed that full momentum equation is giving accurate. I have few questions regarding this;
1. Is it correct if I consider the results from the above explanation for the model calibration?
2. What do you suggest as ds BC i) stage hydrograph ii) rating curve?
3. I am doing this only with HEC-RAS 2D? Is it necessary to go for combined 1D/2D ?
4. How can I show the prevailing of backwater effect quantitatively and qualitatively?
Please clarify above things so that I can run the model quickly