Situation. You are throwing across a body of water. The body of water is OB. There are trees on the side of the water, these trees are IB. Some of the tree branches hang out over the water. Your disc hits some branches of a tree on the other side and clearly goes in the water, and as a result the disc is OB.

Questions:

1. If the base of the tree is IB, does that make the branches of the tree IB or is there a vertical line above the boundary of the OB which determines what part of the branch is OB and what part of the branch is IB on the other side?

2. Based on whether the disc ever touched any part of IB on the other side of the water determines if you mark your lie on the other side of the water, or if you mark it from where it went OB over the initial part of the water?

1. If the base of the tree is IB, does that make the branches of the tree IB or is there a vertical line above the boundary of the OB which determines what part of the branch is OB and what part of the branch is IB on the other side?

Vertical plane up from line made by the water edge.

2. Based on whether the disc ever touched any part of IB on the other side of the water determines if you mark your lie on the other side of the water, or if you mark it from where it went OB over the initial part of the water?

Depends on TD rule. If no TD rule, then mark where it was last IB on the other side if that's your preference. You can also rethrow from the original lie. If TD says you have to land on the other side IB otherwise rethrow or go to a drop zone, then that's the rule even if you kick off IB land on the other side back into OB.

As a general rule, savvy TDs and course designers will figure where the problems are for players making good IB/OB calls. If it's hard to see whether a shot hits overhanging tree branches or not, it probably makes sense to have a drop zone on the other side if shots end up OB and the last point IB may be hard to determine consistently.

There is a similar situation in Topeka, KS. The savy TD of the Mighty Shunga Nunga said at the players meeting that if you hit the tree branches that hang over the lake, that you DID NOT cross back IB and had to use the drop zone. That way there was no argument. The branches were hanging OB.

Lucky for me, I hit the other side and then rolled back into the drink for my OB. :D