Tiling needs somewhere for the water to go. If you dump it into a watershed, you have to deal with whoever controls that. If you dump it into a sink hole you made (pond), you don't need to get anyone's permission. Our wetland and water conservation district people are only concerned with people who add water to their neighbors land, I was told I can dam a seep (creating a pond) and prevent the run off (there's hardly any) from reaching my neighbors land without any issues or permits needed. They're more interested in getting accurate surveys of the existing wetland in the event someone wishes to un-plug the dam and return it to a muck hole.