The draw contour line menu option allows contours 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. You will then be prompted for the contour line elevation. This option can be used to supplement the contours database to allow for a more accurate DEM interpolation from contours as outlined in the Interpolate Aids section.
