You can also redefine the area symbol for water to match what you want to draw in your area, but it's a bit tricky : you'll have to write a metapost function. Bruce Mutton a écrit :

...

Is there a method to represent an area of water that is temporary?

For water flow points and lines there are subtypes like

permanent (default), conjectural, intermittent, paleo; (these don’t all apply to each entity – see the therion book)

There are summer, winter subtypes for air draught points.

I don’t think this was quite what you are asking, however.

I would tend to draw the passage dry and label it “floods regularly” or draw it wet and label it “often dry”

Bruce

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