I assumed that ALL runways were flat, it never occured to me that they might not be. But the first time I went spotting at my home airport, I noticed there is a huge difference in elavation. The rwy27 threshold is level with the terminal area, then it dips down to about 5m below, and then rises to about 5m above, and then stays at that height until the rwy9 threshold. Doesn't sound much, but BELIEVE ME, the runway is one of the worst i've seen (you can't see an aircraft on the rwy9 threshold from the rwy27threshold).
I thought that we were a one off, but the airport closest to me (Filton), is on a camber, much like MAN's main runway, 24R/6L. Where it peaks in height in the middle. Also, BHX is much like Bristol, in fact they are pretty similar apart from EGBB's is longer.. (we are not talking about users' thingy.....nevermind).
Also, I know of Jersey, Munich, Courcheval all have runways that are by no means flat.
So how flat is the runway near you? Anyone have any strange shape ones? Is there a legal limit to how steep a runway can be?