|Quoting steiner (Thread starter):|
1. is a special airspace reserved for this around the airports or is fuel dumped where it is most convenient?
If you're dumping fuel, it's either for test (very small quantity), or an emergency. In either case, you do it where you need to, no clearance required.
In air, it depends on the volume and speed. Done right, it evaporates before it hits the ground so nothing is covered.
Depends on the volume. There's typically no need to dump more than you need to get to landing weight, and that will depend on how much fuel you've got at the time you start. Could be seconds (for a test), could be half an hour or more.
In an emergency, you do what you have to. When we test we try to be above 15,000' to make sure it's all evaporated and doesn't hit the ground.
You can, but you don't have to.