How can I create curved pipes?
The Bentley Hydraulic and Hydrology software does not have the ability to draw curved pipes using arcs and b-splines.
Curved pipes can be modeled with bends. The pipe will appear more curved with additional bends.
There are two ways to add bends to a pipe while placing it.
If you have the curve already drawn in a .DWG or .DXF file, you can use ModelBuilder to import the pipes and the bends will be created automatically.
Yes, when Drawing Mode is set to Scaled (Tools > Options > Drawing tab)
In most cases the increased head loss due to the curvature is negligible. It is possible to increase the Manning's n value to account for extra head loss if you feel it is significant.
Help - Modeling Curved Pipes