Here is a revised version of the previous cavern map. There was a discrepancy with the "elevation" lines so I fixed it. Click to enlarge.
Here is how I see the "elevation lines" working:* The Basics: The water is flowing from top left to mid right. As for the "elevation lines", they represent a distance of anything from 1' to 5' (per line, there is no uniform distance since this is to represent the uneven floor of a natural cave system).
* Starting at the bottom of the map, the lines lead downwards (pretty straight forward at this point).
* Cave 4 has a slight hill in the centre (the two middle lines that flank the bottom and top of the number 4). The lines just above 4 b lead down to cave 8, as does the lines to the right lead down to cave 9.
* Caves 5 & 6 could be at a higher or lower elevation (whichever the DM chooses).
* Cave 9 has a hill in it. The most northern section of cave 9 is level with cave 10.
* The lines to the left of cave 11 lead up. The lines to the right lead down. The new lines in the side tunnel to cave 10 should align things up correctly.
* Cave 12 has two small mounds. The most northern and western line leads down.
* The lines of cave 14 lead downward (towards cave 11).
* The lines in cave 15 lead upwards from the watery entrance.
On a side note: I like the idea that the water that flows into cave 14 b is up higher on the cave wall so the water crashes down into the pool via a waterfall. To explore the source of this waterfalls will require hearty adventures who will have to travel against the current of the water to even find cave 15.
Cheers,
Tim