The draw stream line menu option allows stream alignments to be manually Heads Up Digitised (HUD) in CatchmentSIM. After selecting this menu option use the left mouse button to place each vertex and click the right mouse button when you're finished. This option can be used to create or supplement the stream alignment database to allow for a more accurate DEM interpolation using watercourse interpolation as outlined in Interpolate Aids section. Manually digitised stream alignments may also be useful to treat imported DEMs using the DEM >> Enforce Streams algorithm.
