I’m editing an existing RAS model using Mapper in 5.0.6. I’ve successfully imported DEM and and a land use layer which has been converted to a raster. I can edit and create cross sections and update the XS geo based on the DEM, but cannot figure out how to update or assign n values to the XS, either in Mapper or in the Geometry editor. Is it possible to assign Manning’s n values to 1D cross sections using a shapefile in HEC-RAS?
Thank you but unfortunately the surface roughness of the area I’m modeling is complex and quite varied. I may have to go back to GeoRAS for this. If this is currently impossible, does anyone know when HEC plans on adding that functionality to Mapper? It seems like a significant speed bump if the goal is to move from model development from GeoRAS to Mapper.
Tienes que calcular el “n manning” equivalente para el canal y las planicies de inundación de cada sección. Yo uso excel y la formula de la foto adjunta .
You have to calculate the equivalent “n manning” for the channel and the floodplains of each section. I use excel and the equation of the attached photo