See Also...305 512 ISOM Index Water and marsh index previous next
revision 05/00
304 Uncrossable river
An uncrossable river or canal is drawn with black bank lines. The bank lines are broken at a ford.
Colour: blue 50% (60 lines/cm), black.
Bank line width 0.18mm, minimum river width 0.2mm
As ISOM 2000 but line width was 0.175mm
The default OCAD file uses 301.1 as a bank line (0.18mm black) and 301.0 blue tone or 302, full blue as the infill blue colour.
A black line round a water feature indicates that the feature cannot be crossed under normal weather conditions.
The problem with colour clashes is that the screen and composite (local printer) output does not necessarily reflect the separated output.
If you digitise your map in the same way as you would draw it, that is, you cut out all underlying objects beneath the blue, then there is no colour problem (greening of the rivers).
There are alternatives, the most common method is to make the blue colours automatically knockout the lower colours. To do this, you have to change the colour table. Put zeros ( “-1”'s for OCADv5) in the blue row in each colour column that you want to knockout. Only the colours lower down the colour table are affected. So there will be no effect on symbols using black and street colours.
There are more details in the Main Help File or in the Colour Help file.
To draw a parallel sided waterway such as a canal, define a new symbol using the double line symbol with black 0.18mm lines and a blue fill of the required width.
The bank lines can be broken with the cut (scissors) tool.
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