In the mountain csv test file, starting the flood at (5,3) led to it increasing in elevation to 33. However the points higher than it (4,4)(4,5)(5,4)(5,5) did not get any water and are at elevation 5. The flood node finding algorithm needs to find nodes that are lower in level, it's possibly looking for nodes that are just lower in elevation.
In the mountain csv test file, starting the flood at (5,3) led to it increasing in elevation to 33. However the points higher than it (4,4)(4,5)(5,4)(5,5) did not get any water and are at elevation 5. The flood node finding algorithm needs to find nodes that are lower in level, it's possibly looking for nodes that are just lower in elevation.