I discovered a q11 water.
After reading
http://ringofbrodgar.com/wiki/Finding_h ... ,_and_soil
http://ringofbrodgar.com/wiki/Dowsing_rod
I assume I can apply math to make up for guesswork to include the survey of water under land.
My assumptions are that the tiles from the node degenerate in quality linearly in concentric circle.
I am luck to have a river in a circle surrounding 90%+ of the land area I am surveying. I have gone up and down the river and made dots on a map in MS paint assigning quality numbers per color.
I presume I can take two points and make triangles, preferably equilateral, to come up with a third point. I will, however, have to think about my variables and formula to decide what the third point is. The triangles will still be useful to indicate pattern.
There is an assumption that there will be multiple well points on the land as well, so the triangles will help me conserve well-building resources.
keyword: high quality water